npfctl_parse_fam_addr_mask
$$ = npfctl_parse_fam_addr_mask($1, NULL, &$3);
$$ = npfctl_parse_fam_addr_mask($1, $3, NULL);
$$ = npfctl_parse_fam_addr_mask($1, NULL, NULL);
npfvar_t * npfctl_parse_fam_addr_mask(const char *, const char *,