NFSD_A_EXPKEY_CLIENT
nla_put_string(skb, NFSD_A_EXPKEY_CLIENT,
if (!tb[NFSD_A_EXPKEY_CLIENT])
dom = auth_domain_find(nla_data(tb[NFSD_A_EXPKEY_CLIENT]));
[NFSD_A_EXPKEY_CLIENT] = { .type = NLA_NUL_STRING, },