[PATCH v1] selftests mount: Fix mount_setattr_test builds failed

[Anh Tuan Phan <tuananhlfc@xxxxxxxxx>]

When compiling selftests with target mount_setattr I encountered some errors with the below messages:
mount_setattr_test.c: In function ‘mount_setattr_thread’:
mount_setattr_test.c:343:16: error: variable ‘attr’ has initializer but incomplete type
  343 |         struct mount_attr attr = {
      |                ^~~~~~~~~~

These errors are might be because of linux/mount.h is not included. This patch resolves that issue.

Signed-off-by: Anh Tuan Phan <tuananhlfc@xxxxxxxxx>
---
 tools/testing/selftests/mount_setattr/mount_setattr_test.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/mount_setattr/mount_setattr_test.c b/tools/testing/selftests/mount_setattr/mount_setattr_test.c
index 582669ca38e9..7ca13a924e34 100644
--- a/tools/testing/selftests/mount_setattr/mount_setattr_test.c
+++ b/tools/testing/selftests/mount_setattr/mount_setattr_test.c
@@ -18,6 +18,7 @@
 #include <grp.h>
 #include <stdbool.h>
 #include <stdarg.h>
+#include "linux/mount.h"
 
 #include "../kselftest_harness.h"
 
-- 
2.34.1