btrfs: backref, add unode_aux_to_inode_list helper

Replacing the double cast and ternary conditional with a helper makes
the code easier on the eyes.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Jeff Mahoney 2017-06-28 21:56:56 -06:00 • committed by David Sterba
commit 4dae077a83