mppe_bits_to_string
strlcpy(buf, mppe_bits_to_string(_this->ppp->ccp.mppe_o_bits),
mppe_bits_to_string(_this->ppp->ccp.mppe_p_bits));
strlcpy(obuf, mppe_bits_to_string(our_bits), sizeof(obuf));
strlcpy(pbuf, mppe_bits_to_string(peer_bits), sizeof(pbuf));
static const char *mppe_bits_to_string(uint32_t);