pcd: fix ordering of unregister_cdrom()

We first register cdrom and then we add_disk() and
so we we should likewise unregister the cdrom first and
then del_gendisk().

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/paride/pcd.c

@@ -1021,9 +1021,9 @@ static void __exit pcd_exit(void)
 		if (!cd->present)
 			continue;
 
+		unregister_cdrom(&cd->info);
 		del_gendisk(cd->disk);
 		pi_release(cd->pi);
-		unregister_cdrom(&cd->info);
 		blk_cleanup_disk(cd->disk);
 
 		blk_mq_free_tag_set(&cd->tag_set);