[PATCH] loop clear q->queuedata on exit

Just for niceness, loop should clear queue queuedata when it exits.

drivers/block/loop.c

@@ -806,6 +806,7 @@ static int loop_clr_fd(struct loop_device *lo, struct block_device *bdev)
 	lo->lo_offset = 0;
 	lo->lo_encrypt_key_size = 0;
 	lo->lo_flags = 0;
+	lo->lo_queue.queuedata = NULL;
 	memset(lo->lo_encrypt_key, 0, LO_KEY_SIZE);
 	memset(lo->lo_name, 0, LO_NAME_SIZE);
 	invalidate_bdev(bdev, 0);