style: remove redundant judgment

Signed-off-by: cndoit18 <cndoit18@outlook.com>

cmd/kubeadm/app/cmd/upgrade/common.go

@@ -240,11 +240,7 @@ func runPreflightChecks(client clientset.Interface, ignorePreflightErrors sets.S
 	if err != nil {
 		return err
 	}
-	err = upgrade.RunCoreDNSMigrationCheck(client, ignorePreflightErrors)
-	if err != nil {
-		return err
-	}
-	return nil
+	return upgrade.RunCoreDNSMigrationCheck(client, ignorePreflightErrors)
 }
 
 // getClient gets a real or fake client depending on whether the user is dry-running or not

cmd/kubeadm/app/phases/certs/certlist.go

@@ -471,11 +471,7 @@ func createKeyAndCSR(kubeadmConfig *kubeadmapi.InitConfiguration, cert *KubeadmC
 	if err != nil {
 		return err
 	}
-	err = pkiutil.WriteCSR(certDir, name, csr)
-	if err != nil {
-		return err
-	}
-	return nil
+	return pkiutil.WriteCSR(certDir, name, csr)
 }
 
 // CreateDefaultKeysAndCSRFiles is used in ExternalCA mode to create key files

cmd/kubeadm/app/phases/certs/certs.go

@@ -486,10 +486,7 @@ func validateSignedCertWithCA(l certKeyLocation, caCert *x509.Certificate) error
 func validatePrivatePublicKey(l certKeyLocation) error {
 	// Try to load key
 	_, _, err := pkiutil.TryLoadPrivatePublicKeyFromDisk(l.pkiDir, l.baseName)
-	if err != nil {
 	return errors.Wrapf(err, "failure loading key for %s", l.uxName)
-	}
-	return nil
 }
 
 // validateCertificateWithConfig makes sure that a given certificate is valid at

cmd/kubeadm/app/phases/kubeconfig/kubeconfig.go

@@ -281,11 +281,8 @@ func createKubeConfigFileIfNotExists(outDir, filename string, config *clientcmda
 		}
 		fmt.Printf("[kubeconfig] Writing %q kubeconfig file\n", filename)
 		err = kubeconfigutil.WriteToDisk(kubeConfigFilePath, config)
-		if err != nil {
 		return errors.Wrapf(err, "failed to save kubeconfig file %q on disk", kubeConfigFilePath)
 	}
-		return nil
-	}
 	// kubeadm doesn't validate the existing kubeconfig file more than this (kubeadm trusts the client certs to be valid)
 	// Basically, if we find a kubeconfig file with the same path; the same CA cert and the same server URL;
 	// kubeadm thinks those files are equal and doesn't bother writing a new file

cmd/kubeadm/app/phases/upgrade/preflight.go

@@ -110,8 +110,5 @@ func checkMigration(client clientset.Interface) error {
 
 	currentInstalledCoreDNSversion = strings.TrimLeft(currentInstalledCoreDNSversion, "v")
 	_, err = migration.Migrate(currentInstalledCoreDNSversion, strings.TrimLeft(kubeadmconstants.CoreDNSVersion, "v"), corefile, false)
-	if err != nil {
 	return errors.Wrap(err, "CoreDNS will not be upgraded")
-	}
-	return nil
 }

cmd/kubeadm/app/util/apiclient/wait.go

@@ -249,10 +249,7 @@ func (w *KubeWaiter) WaitForStaticPodHashChange(nodeName, component, previousHas
 	if lastErr != nil {
 		return lastErr
 	}
-	if err != nil {
 	return errors.Wrapf(err, "static Pod hash for component %s on Node %s did not change after %v", component, nodeName, w.timeout)
-	}
-	return nil
 }
 
 // getStaticPodSingleHash computes hashes for a single Static Pod resource

cmd/kubeadm/app/util/copy.go

@@ -23,9 +23,5 @@ import (
 // CopyDir copies the content of a folder
 func CopyDir(src string, dst string) error {
 	cmd := exec.Command("cp", "-r", src, dst)
-	err := cmd.Run()
-	if err != nil {
-		return err
-	}
-	return nil
+	return cmd.Run()
 }

pkg/apis/certificates/validation/validation.go

@@ -87,11 +87,7 @@ func validateCSR(obj *certificates.CertificateSigningRequest) error {
 		return err
 	}
 	// check that the signature is valid
-	err = csr.CheckSignature()
-	if err != nil {
-		return err
-	}
-	return nil
+	return csr.CheckSignature()
 }
 
 func validateCertificate(pemData []byte) error {

pkg/controller/replicaset/metrics/metrics.go

@@ -36,9 +36,5 @@ var SortingDeletionAgeRatio = metrics.NewHistogram(
 
 // Register registers ReplicaSet controller metrics.
 func Register(registrationFunc func(metrics.Registerable) error) error {
-	err := registrationFunc(SortingDeletionAgeRatio)
-	if err != nil {
-		return err
-	}
-	return nil
+	return registrationFunc(SortingDeletionAgeRatio)
 }

pkg/kubectl/cmd/convert/convert.go

@@ -138,10 +138,7 @@ func (o *ConvertOptions) Complete(f cmdutil.Factory, cmd *cobra.Command) (err er
 
 	// build the printer
 	o.Printer, err = o.PrintFlags.ToPrinter()
-	if err != nil {
 	return err
-	}
-	return nil
 }
 
 // RunConvert implements the generic Convert command

pkg/kubelet/cm/devicemanager/plugin/v1beta1/stub.go

@@ -214,10 +214,7 @@ func (m *Stub) Register(kubeletEndpoint, resourceName string, pluginSockDir stri
 	}
 
 	_, err = client.Register(context.Background(), reqt)
-	if err != nil {
 	return err
-	}
-	return nil
 }
 
 // GetDevicePluginOptions returns DevicePluginOptions settings for the device plugin.

pkg/kubelet/util/cache/object_cache.go

@@ -77,9 +77,5 @@ func (c *ObjectCache) Get(key string) (interface{}, error) {
 
 // Add adds objectEntry by using a unique string as the key.
 func (c *ObjectCache) Add(key string, obj interface{}) error {
-	err := c.cache.Add(objectEntry{key: key, obj: obj})
-	if err != nil {
-		return err
-	}
-	return nil
+	return c.cache.Add(objectEntry{key: key, obj: obj})
 }

pkg/volume/emptydir/empty_dir.go

@@ -524,11 +524,7 @@ func (ed *emptyDir) teardownDefault(dir string) error {
 	}
 	// Renaming the directory is not required anymore because the operation executor
 	// now handles duplicate operations on the same volume
-	err = os.RemoveAll(dir)
-	if err != nil {
-		return err
-	}
-	return nil
+	return os.RemoveAll(dir)
 }
 
 func (ed *emptyDir) teardownTmpfsOrHugetlbfs(dir string) error {

plugin/pkg/admission/imagepolicy/config.go

@@ -63,10 +63,7 @@ func normalizeWebhookConfig(config *imagePolicyWebhookConfig) (err error) {
 		return err
 	}
 	config.DenyTTL, err = normalizeConfigDuration("deny cache", time.Second, config.DenyTTL, minDenyTTL, maxDenyTTL, defaultDenyTTL)
-	if err != nil {
 	return err
-	}
-	return nil
 }
 
 func normalizeConfigDuration(name string, scale, value, min, max, defaultValue time.Duration) (time.Duration, error) {

staging/src/k8s.io/apiserver/pkg/registry/generic/registry/dryrun.go

@@ -105,9 +105,5 @@ func (s *DryRunnableStorage) copyInto(in, out runtime.Object) error {
 		return err
 	}
 	_, _, err = s.Codec.Decode(data, nil, out)
-	if err != nil {
 	return err
-	}
-	return nil
-
 }

staging/src/k8s.io/client-go/rest/config.go

@@ -571,10 +571,7 @@ func LoadTLSFiles(c *Config) error {
 	}
 
 	c.KeyData, err = dataFromSliceOrFile(c.KeyData, c.KeyFile)
-	if err != nil {
 	return err
-	}
-	return nil
 }
 
 // dataFromSliceOrFile returns data from the slice (if non-empty), or from the file,

staging/src/k8s.io/client-go/transport/transport.go

@@ -157,10 +157,7 @@ func loadTLSFiles(c *Config) error {
 	}
 
 	c.TLS.KeyData, err = dataFromSliceOrFile(c.TLS.KeyData, c.TLS.KeyFile)
-	if err != nil {
 	return err
-	}
-	return nil
 }
 
 // dataFromSliceOrFile returns data from the slice (if non-empty), or from the file,

staging/src/k8s.io/kubectl/pkg/cmd/apiresources/apiversions.go

@@ -74,10 +74,7 @@ func (o *APIVersionsOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, arg
 	}
 	var err error
 	o.discoveryClient, err = f.ToDiscoveryClient()
-	if err != nil {
 	return err
-	}
-	return nil
 }
 
 // RunAPIVersions does the work

staging/src/k8s.io/kubectl/pkg/cmd/create/create_ingress.go

@@ -211,10 +211,7 @@ func (o *CreateIngressOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, a
 	}
 
 	o.ValidationDirective, err = cmdutil.GetValidationDirective(cmd)
-	if err != nil {
 	return err
-	}
-	return nil
 }
 
 // Validate validates the Ingress object to be created

staging/src/k8s.io/kubectl/pkg/cmd/create/create_namespace.go

@@ -143,10 +143,7 @@ func (o *NamespaceOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args
 	}
 
 	o.ValidationDirective, err = cmdutil.GetValidationDirective(cmd)
-	if err != nil {
 	return err
-	}
-	return nil
 }
 
 // Run calls the CreateSubcommandOptions.Run in NamespaceOpts instance

staging/src/k8s.io/kubectl/pkg/cmd/create/create_rolebinding.go

@@ -152,10 +152,7 @@ func (o *RoleBindingOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, arg
 	}
 
 	o.ValidationDirective, err = cmdutil.GetValidationDirective(cmd)
-	if err != nil {
 	return err
-	}
-	return nil
 }
 
 // Validate validates required fields are set

staging/src/k8s.io/kubectl/pkg/cmd/expose/expose.go

@@ -381,10 +381,7 @@ func (o *ExposeServiceOptions) RunExpose(cmd *cobra.Command, args []string) erro
 
 		return o.PrintObj(actualObject, o.Out)
 	})
-	if err != nil {
 	return err
-	}
-	return nil
 }
 
 func (o *ExposeServiceOptions) createService() (*corev1.Service, error) {

staging/src/k8s.io/kubectl/pkg/cmd/set/set_resources.go

@@ -199,10 +199,7 @@ func (o *SetResourcesOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, ar
 	}
 
 	o.Infos, err = builder.Do().Infos()
-	if err != nil {
 	return err
-	}
-	return nil
 }
 
 // Validate makes sure that provided values in ResourcesOptions are valid

staging/src/k8s.io/kubectl/pkg/cmd/set/set_serviceaccount.go

@@ -174,10 +174,7 @@ func (o *SetServiceAccountOptions) Complete(f cmdutil.Factory, cmd *cobra.Comman
 			Latest()
 	}
 	o.infos, err = builder.Do().Infos()
-	if err != nil {
 	return err
-	}
-	return nil
 }
 
 // Run creates and applies the patch either locally or calling apiserver.

staging/src/k8s.io/kubectl/pkg/cmd/util/editor/editoptions.go

@@ -589,10 +589,7 @@ func (o *EditOptions) annotationPatch(update *resource.Info) error {
 		WithFieldValidation(o.ValidationDirective).
 		WithSubresource(o.Subresource)
 	_, err = helper.Patch(o.CmdNamespace, update.Name, patchType, patch, nil)
-	if err != nil {
 	return err
-	}
-	return nil
 }
 
 // GetApplyPatch is used to get and apply patches

staging/src/k8s.io/legacy-cloud-providers/gce/gce_tpu.go

@@ -104,10 +104,7 @@ func (g *Cloud) DeleteTPU(ctx context.Context, name, zone string) error {
 		return err
 	}
 	err = getErrorFromTPUOp(op)
-	if err != nil {
 	return err
-	}
-	return nil
 }
 
 // GetTPU returns the Cloud TPU with the specified name in the specified zone.