osd: fix proc_replica_log when peer log is empty
osd: fix proc_replica_log when peer log is empty

If the peer log is empty, and we break out of the loop on the first pass,
then clearly last_update has not been adjusted.

Signed-off-by: Sage Weil <c5b6ff1fd4f0bde10db63d7a3e07166cf6c4229f@dreamhost.com>

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