Run go fmt

Signed-off-by: huzhifeng <huzhifeng@douyu.tv>

cmd/kube-proxy/proxy.go

@@ -43,7 +43,7 @@ func main() {
 	defer logs.FlushLogs()
 
 	if err := command.Execute(); err != nil {
-		fmt.Fprintf(os.Stderr, "%v\n", err)
+		fmt.Fprintf(os.Stderr, "error: %v\n", err)
 		os.Exit(1)
 	}
 }