Revert "UBUNTU: SAUCE: nbd: ratelimit error msgs after socket close"

BugLink: http://bugs.launchpad.net/bugs/1580754

This reverts commit 28c8fd86.

Revert in favor of upstream stable.
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

drivers/block/nbd.c

@@ -618,8 +618,8 @@ static void nbd_request_handler(struct request_queue *q)
 			req, req->cmd_type);
 
 		if (unlikely(!nbd->sock)) {
-			dev_err_ratelimited(disk_to_dev(nbd->disk),
-					    "Attempted send on closed socket\n");
+			dev_err(disk_to_dev(nbd->disk),
+				"Attempted send on closed socket\n");
 			req->errors++;
 			nbd_end_request(nbd, req);
 			spin_lock_irq(q->queue_lock);