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>

diff --git a/cmds-balance.c b/cmds-balance.c
index e9e388e..c9f1288 100644 (file)
--- 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);