client: do not leak MetaRequests on get_or_create() failure
client: do not leak MetaRequests on get_or_create() failure

Avoid leaking in the error paths.

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

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