nfsd4: re-probe callback on connection loss

This makes sure we set the sequence flag when necessary.
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfs4state.c

@@ -642,7 +642,7 @@ static void nfsd4_conn_lost(struct svc_xpt_user *u)
 		free_conn(c);
 	}
 	spin_unlock(&clp->cl_lock);
-	/* XXX: mark callback for update, probe callback */
+	nfsd4_probe_callback(clp);
 }
 
 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)