[PATCH 12/13] selftests/fs/mount-notify-ns: Fix build failures seen with -Werror

[Guenter Roeck]

Fix

mount-notify_test_ns.c: In function ‘fanotify_rmdir’:
mount-notify_test_ns.c:494:17: error:
        ignoring return value of ‘chdir’ declared with attribute 
‘warn_unused_result’

by checking and then ignoring the return value of chdir().

Fixes: 781091f3f5945 ("selftests/fs/mount-notify: add a test variant running 
inside userns")
Cc: Amir Goldstein <amir7...@gmail.com>
Signed-off-by: Guenter Roeck <li...@roeck-us.net>
---
 .../selftests/filesystems/mount-notify/mount-notify_test_ns.c  | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git 
a/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c 
b/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c
index 9f57ca46e3af..949c76797f92 100644
--- a/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c
+++ b/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c
@@ -491,7 +491,8 @@ TEST_F(fanotify, rmdir)
        ASSERT_GE(ret, 0);
 
        if (ret == 0) {
-               chdir("/");
+               if (chdir("/"))
+                       ;
                unshare(CLONE_NEWNS);
                mount("", "/", NULL, MS_REC|MS_PRIVATE, NULL);
                umount2("/a", MNT_DETACH);
-- 
2.43.0