[PATCH] selftests: filesystems: add return value checks

[Abhinav Jain]

Add ksft_exit_fail_msg() return value checks for fchdir() & chroot()
to address the selftests statmount test compile warnings

statmount_test.c:127:2: warning: ignoring return value of ‘fchdir’,
declared with attribute warn_unused_result [-Wunused-result]
  127 |  fchdir(orig_root);
      |  ^~~~~~~~~~~~~~~~~
statmount_test.c:128:2: warning: ignoring return value of ‘chroot’,
declared with attribute warn_unused_result [-Wunused-result]
  128 |  chroot(".");
      |  ^~~~~~~~~~~

Signed-off-by: Abhinav Jain <jain.abhinav...@gmail.com>
---
 .../filesystems/statmount/statmount_test.c          | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/filesystems/statmount/statmount_test.c 
b/tools/testing/selftests/filesystems/statmount/statmount_test.c
index e6d7c4f1c85b..b5e1247233b6 100644
--- a/tools/testing/selftests/filesystems/statmount/statmount_test.c
+++ b/tools/testing/selftests/filesystems/statmount/statmount_test.c
@@ -125,8 +125,17 @@ static uint32_t old_root_id, old_parent_id;
 
 static void cleanup_namespace(void)
 {
-       fchdir(orig_root);
-       chroot(".");
+       int ret;
+
+       ret = fchdir(orig_root);
+       if (ret == -1)
+               ksft_exit_fail_msg("changing current directory: %s\n",
+                               strerror(errno));
+
+       ret = chroot(".");
+       if (ret == -1)
+               ksft_exit_fail_msg("chroot: %s\n", strerror(errno));
+
        umount2(root_mntpoint, MNT_DETACH);
        rmdir(root_mntpoint);
 }
-- 
2.34.1