tlv_next
} while (tlv_next(&tlv, pdu, len));
} while (tlv_next(&tlv, pdu, len));
ok = tlv_next(&tlv, buf, len);
ok = tlv_next(&tlv, buf, rv);
ok = tlv_next(&tlv, buf, rv);
int tlv_next(struct tlv *, const void *, size_t);