osd: fix merge_old_entry bug
osd: fix merge_old_entry bug

We want to revise_need to the _new_ entry's version, not the old one
(which is what missing already refers to).

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