mds: Remove unused variable.
mds: Remove unused variable.

Fixes compile complaint. Was made useless in commit
6d29fc66326ff40443ac465c84d6f7bddf3cee4f.

Signed-off-by: Greg Farnum <0bcb4295d38ee745130ea5f2bb88ef4eef474e61@dreamhost.com>

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph