From 3d9286f089c5661641da9651cf56bd4f1666d4db Mon Sep 17 00:00:00 2001
From: huwenbo <huwenbo@didichuxing.com>
Date: Tue, 13 Jun 2017 15:34:57 +0800
Subject: [PATCH] fix panic: sync: negative WaitGroup counter

---
 grace/conn.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/grace/conn.go b/grace/conn.go
index f5d2b236..4553e182 100644
--- a/grace/conn.go
+++ b/grace/conn.go
@@ -36,4 +36,4 @@ func (c graceConn) Close() (err error) {
 	c.closed = true
 	c.m.Unlock()
 	return c.Conn.Close()
-}
\ No newline at end of file
+}