ObjFW  Diff

		if (OFPlainMutexUnlock(&mutex) != 0)
			OBJC_ERROR("Failed to unlock mutex!");

		return 0;
	}

	OBJC_ERROR("objc_sync_exit() was called for an object not locked!");
	OBJC_ERROR("objc_sync_exit() was called for an unlocked object!");
#else
	return 0;
#endif
}