mds: warn on dup inodes; don't crash
mds: warn on dup inodes; don't crash

We just ignore the second instance of the inode.  It can get
cleaned up transparently if/when the directory gets saved.

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