rem: if (check_inverse(optarg, &invert)) optind++;
add: check_inverse(optarg, &invert, &optind, 0);
context: parse(int c, char **argv, int invert, unsigned int *flags,      const struct ipt_entry *entry,      unsigned int *nfcache,      struct ipt_entry_match **match){	struct ipt_tcpmss_match_info *mssinfo =		(struct ipt_tcpmss_match_info *)(*match)->data;	switch (c) {	case '1':		if (*flags)			exit_error(PARAMETER_PROBLEM,				   "Only one `--mss' allowed");		if (check_inverse(optarg, &invert))			optind++;		parse_tcp_mssvalues(argv[optind-1],				    &mssinfo->mss_min, &mssinfo->mss_max);		if (invert)			mssinfo->invert = 1;		*flags = 1;		break;	default:		return 0;	}	return 1;}