ceph: remove useless check

rc is only ever 0 or negative in this method.
Signed-off-by: Sage Weil <sage@newdream.net>

fs/ceph/addr.c

@@ -880,8 +880,6 @@ static int ceph_writepages_start(struct address_space *mapping,
 out:
 	if (req)
 		ceph_osdc_put_request(req);
-	if (rc > 0)
-		rc = 0;  /* vfs expects us to return 0 */
 	ceph_put_snap_context(snapc);
 	dout("writepages done, rc = %d\n", rc);
 	return rc;