NFSv4: Don't retry the GETATTR on old stateid in nfs4_delegreturn_done()

If the server returns NFS4ERR_OLD_STATEID, then just skip retrying the
GETATTR when replaying the delegreturn compound. We know nothing will
have changed on the server.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/nfs4proc.c

@@ -6198,6 +6198,10 @@ static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
 	case -NFS4ERR_OLD_STATEID:
 		if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
 			nfs4_stateid_seqid_inc(&data->stateid);
+		if (data->args.bitmask) {
+			data->args.bitmask = NULL;
+			data->res.fattr = NULL;
+		}
 		goto out_restart;
 	case -NFS4ERR_ACCESS:
 		if (data->args.bitmask) {