[SCSI] SCSI core: fix leakage of scsi_cmnd's

Actually, just one problem and one cosmetic fix:

1) We need to dequeue for the loop and kill case (it seems easiest
simply to dequeue in the scsi_kill_request() routine)
2) There's no real need to drop the queue lock. __scsi_done() is lock
agnostic, so since there's no requirement, let's just leave it in to
avoid any locking issues.

Signed-off-by: James Bottomley <[e-mail]>

drivers/scsi/scsi_lib.c

···
 {
 	struct scsi_cmnd *cmd = req->special;
 
-	spin_unlock(q->queue_lock);
+	blkdev_dequeue_request(req);
+
 	if (unlikely(cmd == NULL)) {
 		printk(KERN_CRIT "impossible request in %s.\n",
 				 __FUNCTION__);
···
 	cmd->result = DID_NO_CONNECT << 16;
 	atomic_inc(&cmd->device->iorequest_cnt);
 	__scsi_done(cmd);
-	spin_lock(q->queue_lock);
 }
 
 /*
···
 		if (unlikely(!scsi_device_online(sdev))) {
 			printk(KERN_ERR "scsi%d (%d:%d): rejecting I/O to offline device\n",
 			       sdev->host->host_no, sdev->id, sdev->lun);
-			blkdev_dequeue_request(req);
 			scsi_kill_request(req, q);
 			continue;
 		}