fix root.go.golden (#1552)

cobra/cmd/testdata/root.go.golden

@@ -43,7 +43,10 @@ to quickly create a Cobra application.`,
 // Execute adds all child commands to the root command and sets flags appropriately.
 // This is called by main.main(). It only needs to happen once to the rootCmd.
 func Execute() {
-	cobra.CheckErr(rootCmd.Execute())
+	err := rootCmd.Execute()
+	if err != nil {
+		os.Exit(1)
+	}
 }
 
 func init() {