ceph: handle errors during osd client init

Unwind initializing if we get ENOMEM during client initialization.

Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index 0751b82..7c43948 100644
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -282,7 +282,7 @@
 extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc,
 			     struct ceph_msg *msg, int mds);
 
-extern void ceph_mdsc_init(struct ceph_mds_client *mdsc,
+extern int ceph_mdsc_init(struct ceph_mds_client *mdsc,
 			   struct ceph_client *client);
 extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
 extern void ceph_mdsc_stop(struct ceph_mds_client *mdsc);