mds: make adjust_dir_fragments always adjust fragtree
mds: make adjust_dir_fragments always adjust fragtree

If we have the inode but no dirfrags, we still need to adjust the
inode dirfragtree.

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

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