ubi: block: Fix a possible use-after-free bug in ubiblock_create()

Smatch warns:
	drivers/mtd/ubi/block.c:438 ubiblock_create()
	warn: '&dev->list' not removed from list

'dev' is freed in 'out_free_dev:, but it is still on the list.

To fix this, delete the list item before freeing.

Fixes: 91cc8fbcc8 ("ubi: block: set BLK_MQ_F_BLOCKING")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Richard Weinberger <richard@nod.at>

drivers/mtd/ubi/block.c

@@ -429,6 +429,7 @@ int ubiblock_create(struct ubi_volume_info *vi)
 	return 0;
 
 out_remove_minor:
+	list_del(&dev->list);
 	idr_remove(&ubiblock_minor_idr, gd->first_minor);
 out_cleanup_disk:
 	put_disk(dev->gd);