fix:delete redundant local variable

Change-Id: Ia3a01d91866a96f8b47c66a4af0042254e24f69f

kal/posix/src/semaphore.c

@@ -157,7 +157,6 @@ int sem_timedwait(sem_t *sem, const struct timespec *timeout)
 {
     UINT32 ret;
     long long tickCnt;
-    struct timespec tsNow = { 0 };
 
     if ((sem == NULL) || (sem->s_magic != _SEM_MAGIC)) {
         errno = EINVAL;