ceph: reset r_resend_mds after receiving -ESTALE

this makes __choose_mds() choose mds according caps
Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>

fs/ceph/mds_client.c

@@ -2254,6 +2254,7 @@ static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
 	 */
 	if (result == -ESTALE) {
 		dout("got ESTALE on request %llu", req->r_tid);
+		req->r_resend_mds = -1;
 		if (req->r_direct_mode != USE_AUTH_MDS) {
 			dout("not using auth, setting for that now");
 			req->r_direct_mode = USE_AUTH_MDS;