Commit "btrfs: ulist: Add ulist_del() function" (d4b80404)
removed some debugging code but left the structure defintions.
Reviewed-by: NQu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: NLiu Bo <bo.li.liu@oracle.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>