remove unused code in kubeadm error.go

cmd/kubeadm/app/util/error.go

@@ -33,10 +33,6 @@ const (
 	ValidationExitCode = 3
 )
 
-type debugError interface {
-	DebugError() (msg string, args []interface{})
-}
-
 // fatal prints the message if set and then exits.
 func fatal(msg string, code int) {
 	if len(msg) > 0 {
@@ -56,7 +52,7 @@ func fatal(msg string, code int) {
 // This method is generic to the command in use and may be used by non-Kubectl
 // commands.
 func CheckErr(err error) {
-	checkErr("", err, fatal)
+	checkErr(err, fatal)
 }
 
 // preflightError allows us to know if the error is a preflight error or not
@@ -66,8 +62,8 @@ type preflightError interface {
 }
 
 // checkErr formats a given error as a string and calls the passed handleErr
-// func with that string and an kubectl exit code.
+// func with that string and an exit code.
-func checkErr(prefix string, err error, handleErr func(string, int)) {
+func checkErr(err error, handleErr func(string, int)) {
 	switch err.(type) {
 	case nil:
 		return

cmd/kubeadm/app/util/error_test.go

@@ -42,7 +42,7 @@ func TestCheckErr(t *testing.T) {
 
 	for _, rt := range tokenTest {
 		codeReturned = 0
-		checkErr("", rt.e, errHandle)
+		checkErr(rt.e, errHandle)
 		if codeReturned != rt.expected {
 			t.Errorf(
 				"failed checkErr:\n\texpected: %d\n\t  actual: %d",