kubeadm: fix gocritic lint errors

.golangci.yaml

@@ -13,7 +13,7 @@ issues:
         - ineffassign
     # TODO(oscr) Remove these excluded directories and fix findings. Due to large amount of findings in different components
     # with different owners it's hard to fix everything in a single pr. This will therefore be done in multiple prs.
-    - path: (pkg/volume/*|test/*|cmd/kubeadm/*|azure/*|pkg/cmd/wait*|request/bearertoken/*|metrics/*|filters/*)
+    - path: (pkg/volume/*|test/*|azure/*|pkg/cmd/wait*|request/bearertoken/*|metrics/*|filters/*)
       linters:
         - gocritic
 

cmd/kubeadm/app/cmd/util/cmdutil.go

@@ -123,7 +123,7 @@ func InteractivelyConfirmAction(action, question string, r io.Reader) error {
 		return errors.Wrap(err, "couldn't read from standard input")
 	}
 	answer := scanner.Text()
-	if strings.ToLower(answer) == "y" || strings.ToLower(answer) == "yes" {
+	if strings.EqualFold(answer, "y") || strings.EqualFold(answer, "yes") {
 		return nil
 	}