Return from the function

vvin.go

@@ -82,9 +82,7 @@ func Start(args []string) error {
 	app.Usage = ``
 	app.Copyright = "(C) 2019 Shuhei Kubota"
 	app.SuppressErrorOutput = true
-	if err := app.Run(os.Args); err != nil {
-		fmt.Fprintln(os.Stderr, err)
-	}
+	return app.Run(args)
 }
 
 var (