From 92a149777adc9f9da656cff9908159495b893ea7 Mon Sep 17 00:00:00 2001
From: bufferflies <1045931706@qq.com>
Date: Tue, 21 Dec 2021 11:21:21 +0800
Subject: [PATCH] string nil

Signed-off-by: bufferflies <1045931706@qq.com>
---
 tools/pd-ctl/pdctl/ctl.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/pd-ctl/pdctl/ctl.go b/tools/pd-ctl/pdctl/ctl.go
index d0a3877e6d83..ef3c14672083 100644
--- a/tools/pd-ctl/pdctl/ctl.go
+++ b/tools/pd-ctl/pdctl/ctl.go
@@ -205,7 +205,7 @@ func ReadStdin(r io.Reader) (input []string, err error) {
 	if err != nil {
 		return nil, err
 	}
-	if s := strings.TrimSpace(string(b)); s != "" {
+	if s := strings.TrimSpace(string(b)); len(s) > 0 {
 		input = strings.Split(s, " ")
 	}
 	return input, nil