Increment in_seq even when the message is skipped for some reason.
Signed-off-by: Sage Weil <sage@newdream.net>
                        con->in_base_pos = -front_len - middle_len - data_len -
                                sizeof(m->footer);
                        con->in_tag = CEPH_MSGR_TAG_READY;
+                       con->in_seq++;
                        return 0;
                }
                if (IS_ERR(con->in_msg)) {
                ceph_msg_put(con->in_msg);
                con->in_msg = NULL;
                con->in_tag = CEPH_MSGR_TAG_READY;
+               con->in_seq++;
        } else {
                dout("con_revoke_pages %p msg %p pages %p no-op\n",
                     con, con->in_msg, msg);