remove unnessary cast in libdispatch_tsd_cleanup

Author: frankeh

src/queue.c

@@ -1006,8 +1006,7 @@ _libdispatch_tsd_cleanup(void *ctx)
 	_tsd_call_cleanup(dispatch_bcounter_key, NULL);
 #endif
 #if DISPATCH_LOCK_USE_SEMAPHORE_FALLBACK
-	_tsd_call_cleanup(dispatch_sema4_key,
-			(void (*)(void *))_dispatch_thread_semaphore_dispose);
+	_tsd_call_cleanup(dispatch_sema4_key, _dispatch_thread_semaphore_dispose);
 #endif
 	_tsd_call_cleanup(dispatch_priority_key, NULL);
 	_tsd_call_cleanup(dispatch_voucher_key, _voucher_thread_cleanup);