NFS: Trunking detection should handle ERESTARTSYS/EINTR

Currently, it will return EIO in those cases.
Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>

fs/nfs/nfs4state.c

@@ -2134,6 +2134,8 @@ int nfs4_discover_server_trunking(struct nfs_client *clp,
 	put_rpccred(cred);
 	switch (status) {
 	case 0:
+	case -EINTR:
+	case -ERESTARTSYS:
 		break;
 	case -ETIMEDOUT:
 		if (clnt->cl_softrtry)