[COMMITTED] nptl: Replace FALLTHROUGH with [[fallthrough]]

[Adhemerval Zanella]

The b9579342c6 reinstate '/* FALLTHROUGH */' that were replaced
the the C23 [[fallthrough]] by 970364dac0.
---
 nptl/pthread_mutex_timedlock.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/nptl/pthread_mutex_timedlock.c b/nptl/pthread_mutex_timedlock.c
index 598c6a0710..0664e4f02b 100644
--- a/nptl/pthread_mutex_timedlock.c
+++ b/nptl/pthread_mutex_timedlock.c
@@ -76,8 +76,7 @@ __pthread_mutex_clocklock_common (pthread_mutex_t *mutex,
       /* Check whether we already hold the mutex.  */
       if (__glibc_unlikely (mutex->__data.__owner == id))
 	return EDEADLK;
-
-      /* FALLTHROUGH */
+      [[fallthrough]];
 
     case PTHREAD_MUTEX_TIMED_NP:
       /* Normal mutex.  */
-- 
2.43.0