btrfs: remove unused member list from btrfs_end_io_wq

The end io work queue items have been tracked by the work queues since
"Btrfs: Add async worker threads for pre and post IO checksumming"
(8b71284292) (2008).

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2017-04-13 19:11:04 +02:00
commit c9fed2bb61