Revert "[SCSI] fix bsg queue oops with iscsi logout"

This reverts commit 4b6f5b3a.

bsg takes a reference to the underlying generic device, so it's
impossible to unregister bsg in the device release routine.
Acked-by: NFUJITA Tomonori <tomof@acm.org>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/scsi_sysfs.c

@@ -294,7 +294,6 @@ static void scsi_device_dev_release_usercontext(struct work_struct *work)
 	}
 
 	if (sdev->request_queue) {
-		bsg_unregister_queue(sdev->request_queue);
 		sdev->request_queue->queuedata = NULL;
 		/* user context needed to free queue */
 		scsi_free_queue(sdev->request_queue);
@@ -858,6 +857,7 @@ void __scsi_remove_device(struct scsi_device *sdev)
 	if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 		return;
 
+	bsg_unregister_queue(sdev->request_queue);
 	class_device_unregister(&sdev->sdev_classdev);
 	transport_remove_device(dev);
 	device_del(dev);