Revert "Merge pull request kubernetes-sigs#3153 from guettli/fix-empty-auth-nil-pointer-exception-in-stop"

This reverts commit d82dcd8, reversing
changes made to 1561e8c.

Author: MitchLewis930

pkg/internal/testing/controlplane/apiserver.go

@@ -384,10 +384,10 @@ func (s *APIServer) populateAPIServerCerts() error {
 		return err
 	}
 
-	if err := os.WriteFile(filepath.Join(s.CertDir, "apiserver.crt"), certData, 0o640); err != nil {
+	if err := os.WriteFile(filepath.Join(s.CertDir, "apiserver.crt"), certData, 0640); err != nil {
 		return err
 	}
-	if err := os.WriteFile(filepath.Join(s.CertDir, "apiserver.key"), keyData, 0o640); err != nil {
+	if err := os.WriteFile(filepath.Join(s.CertDir, "apiserver.key"), keyData, 0640); err != nil {
 		return err
 	}
 
@@ -404,10 +404,10 @@ func (s *APIServer) populateAPIServerCerts() error {
 		return err
 	}
 
-	if err := os.WriteFile(filepath.Join(s.CertDir, saCertFile), saCert, 0o640); err != nil {
+	if err := os.WriteFile(filepath.Join(s.CertDir, saCertFile), saCert, 0640); err != nil {
 		return err
 	}
-	return os.WriteFile(filepath.Join(s.CertDir, saKeyFile), saKey, 0o640)
+	return os.WriteFile(filepath.Join(s.CertDir, saKeyFile), saKey, 0640)
 }
 
 // Stop stops this process gracefully, waits for its termination, and cleans up
@@ -421,9 +421,6 @@ func (s *APIServer) Stop() error {
 			return err
 		}
 	}
-	if s.Authn == nil {
-		return nil
-	}
 	return s.Authn.Stop()
 }