sk_vpd_readbyte
static uint8_t sk_vpd_readbyte(struct sk_softc *, int);
ptr[i] = sk_vpd_readbyte(sc, i + addr);
sc->sk_vpd_prodname[i] = sk_vpd_readbyte(sc, i + pos);
sc->sk_vpd_readonly[i] = sk_vpd_readbyte(sc, i + pos);