[PATCH] nbd compile fix.

include/linux/nbd.h

@@ -70,7 +70,7 @@ struct nbd_device {
 	struct file * file; 		/* If == NULL, device is not ready, yet	*/
 	int magic;			/* FIXME: not if debugging is off	*/
 	struct list_head queue_head;	/* Requests are added here...			*/
-	struct semaphore queue_lock;
+	struct semaphore tx_lock;
 };
 #endif