[PATCH] selftests: memcg: don't close an uninitialized fd

[Sasha Levin <sashal@kernel.org>]

test_memcg_inotify_delete_file() and test_memcg_inotify_delete_dir()
jump to cleanup before the inotify fd is created when cg_name() or
cg_create() fails, and cleanup then closes whatever fd holds:

  test_memcontrol.c:1685:6: warning: variable 'fd' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]

Initialize fd to -1.

Fixes: 2de27980e1d46 ("selftests: memcg: Add tests for IN_DELETE_SELF and IN_IGNORED")
Assisted-by: LLM
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 tools/testing/selftests/cgroup/test_memcontrol.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c
index 0ed82347044ed..047d487f6dd57 100644
--- a/tools/testing/selftests/cgroup/test_memcontrol.c
+++ b/tools/testing/selftests/cgroup/test_memcontrol.c
@@ -1678,7 +1678,7 @@ static int test_memcg_inotify_delete_file(const char *root)
 {
 	int ret = KSFT_FAIL;
 	char *memcg = NULL;
-	int fd, wd;
+	int fd = -1, wd;
 
 	memcg = cg_name(root, "memcg_test_0");
 
@@ -1723,7 +1723,7 @@ static int test_memcg_inotify_delete_dir(const char *root)
 {
 	int ret = KSFT_FAIL;
 	char *memcg = NULL;
-	int fd, wd;
+	int fd = -1, wd;
 
 	memcg = cg_name(root, "memcg_test_0");
 
-- 
2.53.0