mds: drop bad assert
mds: drop bad assert

Introduced by f1921c3a952726e025773979a7597de793897058.  Should probably
audit this code.

Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@newdream.net>

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