dns_key_error
prep->payload.data[dns_key_error] = ERR_PTR(-derrno);
if (prep->payload.data[dns_key_error]) {
kleave(" = 0 [h_error %ld]", PTR_ERR(prep->payload.data[dns_key_error]));
int err = PTR_ERR(key->payload.data[dns_key_error]);
int err = PTR_ERR(key->payload.data[dns_key_error]);
ret = PTR_ERR(rkey->payload.data[dns_key_error]);