bwfm_fwvar_var_get_data
int bwfm_fwvar_var_get_data(struct bwfm_softc *, char *, void *, size_t);
ret = bwfm_fwvar_var_get_data(sc, name, data, sizeof(*data));
if (bwfm_fwvar_var_get_data(sc, "cur_etheraddr", ic->ic_myaddr,
if (bwfm_fwvar_var_get_data(sc, "sta_info", &sta, sizeof(sta)))