From 6cd3ed9e7e351ddda4017b273da1b900f7ed1e34 Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.com>
Date: Tue, 26 Jul 2016 19:11:42 +0200
Subject: [PATCH] btrfs-progs: balance: silence compiler warning

cmds-balance.c: In function 'cmd_balance_start':
cmds-balance.c:654:6: warning: ignoring return value of 'chdir', declared with
		attribute warn_unused_result [-Wunused-result]
	chdir("/");

Reported-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---
 cmds-balance.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/cmds-balance.c b/cmds-balance.c
index e9e388e8..c9f1288a 100644
--- a/cmds-balance.c
+++ b/cmds-balance.c
@@ -646,7 +646,12 @@ static int cmd_balance_start(int argc, char **argv)
 				"unable to fork to run balance in background");
 				exit(1);
 			case (0):
-				chdir("/");
+				/*
+				 * Read the return value to silence compiler
+				 * warning. Change to / should succeed and
+				 * we're not in a security-sensitive context.
+				 */
+				i = chdir("/");
 				close(0);
 				close(1);
 				close(2);