[PATCH] kselftest: futex: Fix memset with zero size warning

[Wake Liu <wakel@google.com>]

The `FIXTURE(args)` macro defines an empty `struct _test_data_args`,
leading to `sizeof(struct _test_data_args)` evaluating to 0. This
caused a build error due to a compiler warning on a `memset` call
with a zero size argument.

Adding a dummy member to the struct ensures its size is non-zero,
resolving the build issue.

Signed-off-by: Wake Liu <wakel@google.com>
---
 tools/testing/selftests/futex/functional/futex_requeue_pi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/futex/functional/futex_requeue_pi.c b/tools/testing/selftests/futex/functional/futex_requeue_pi.c
index f299d75848cd..000fec468835 100644
--- a/tools/testing/selftests/futex/functional/futex_requeue_pi.c
+++ b/tools/testing/selftests/futex/functional/futex_requeue_pi.c
@@ -52,6 +52,7 @@ struct thread_arg {
 
 FIXTURE(args)
 {
+	char dummy;
 };
 
 FIXTURE_SETUP(args)
-- 
2.52.0.rc1.455.g30608eb744-goog