fix staticcheck faulures in 'cmd' pkg

cmd/kube-proxy/app/server.go

@@ -597,6 +597,7 @@ func (s *ProxyServer) Run() error {
 			w.Header().Set("X-Content-Type-Options", "nosniff")
 			fmt.Fprintf(w, "%s", s.ProxyMode)
 		})
+		//lint:ignore SA1019 See the Metrics Stability Migration KEP
 		proxyMux.Handle("/metrics", legacyregistry.Handler())
 		if s.EnableProfiling {
 			routes.Profiling{}.Install(proxyMux)

cmd/linkcheck/links.go

@@ -72,7 +72,7 @@ var (
 )
 
 func newWalkFunc(invalidLink *bool, client *http.Client) filepath.WalkFunc {
-	return func(filePath string, info os.FileInfo, err error) error {
+	return func(filePath string, info os.FileInfo, initErr error) error {
 		hasSuffix := false
 		for _, suffix := range *fileSuffix {
 			hasSuffix = hasSuffix || strings.HasSuffix(info.Name(), suffix)

cmd/preferredimports/preferredimports.go

@@ -27,7 +27,6 @@ import (
 	"go/format"
 	"go/parser"
 	"go/token"
-	"golang.org/x/crypto/ssh/terminal"
 	"io/ioutil"
 	"log"
 	"os"
@@ -35,6 +34,8 @@ import (
 	"regexp"
 	"sort"
 	"strings"
+
+	"golang.org/x/crypto/ssh/terminal"
 )
 
 var (

hack/.staticcheck_failures

@@ -1,7 +1,5 @@
 cluster/images/etcd-version-monitor
 cluster/images/etcd/migrate
-cmd/kube-proxy/app
-cmd/linkcheck
 pkg/controller/daemon
 pkg/controller/deployment
 pkg/controller/disruption