From 7c76435bf79e3c942ebca72dfbfa61f51ec447f1 Mon Sep 17 00:00:00 2001
From: Josh Bleecher Snyder <josh@tailscale.com>
Date: Thu, 14 Jan 2021 16:51:17 -0800
Subject: [PATCH] wgengine/magicsock: simplify

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
---
 wgengine/magicsock/magicsock.go | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/wgengine/magicsock/magicsock.go b/wgengine/magicsock/magicsock.go
index fc1c1a8b4..ad5d1003e 100644
--- a/wgengine/magicsock/magicsock.go
+++ b/wgengine/magicsock/magicsock.go
@@ -2253,11 +2253,10 @@ func (c *Conn) LastMark() uint32           { return 0 }
 // Only the first close does anything. Any later closes return nil.
 func (c *Conn) Close() error {
 	c.mu.Lock()
+	defer c.mu.Unlock()
 	if c.closed {
-		c.mu.Unlock()
 		return nil
 	}
-	defer c.mu.Unlock()
 
 	for _, ep := range c.endpointOfDisco {
 		ep.stopAndReset()