Properly handle the close of run loop on macOS (#522)

- as per documentation `kCFRunLoopRunStopped` should be handled once the runloop is closed via `CFRunLoopStop`;
- if it is not handled - a race condition/crash may happen on the latest macOS when a device gets disconnected while being open;

mac/hid.c

@@ -877,7 +877,7 @@ static void *read_thread(void *param)
 	while (!dev->shutdown_thread && !dev->disconnected) {
 		code = CFRunLoopRunInMode(dev->run_loop_mode, 1000/*sec*/, FALSE);
 		/* Return if the device has been disconnected */
-		if (code == kCFRunLoopRunFinished) {
+		if (code == kCFRunLoopRunFinished || code == kCFRunLoopRunStopped) {
 			dev->disconnected = 1;
 			break;
 		}