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clean up some -Wunused-but-set-variable.

this file had it's own verison of TCHECK, but also not. not the best.

/*	$OpenBSD: print-frag6.c,v 1.11 2022/01/05 05:35:19 dlg Exp $	*/

/*
 * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>

#include <net/if.h>

#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/tcp.h>

#include <stdio.h>

#include <netinet/ip6.h>

#include "interface.h"
#include "addrtoname.h"

int
frag6_print(const u_char *bp, const u_char *bp2)
{
	const struct ip6_frag *dp;
	const struct ip6_hdr *ip6;

	dp = (struct ip6_frag *)bp;
	ip6 = (struct ip6_hdr *)bp2;

	TCHECK(dp->ip6f_ident);

	printf("frag (0x%08x:%ld@%d%s)",
	    ntohl(dp->ip6f_ident),
	    sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) -
		(long)(bp - bp2) - sizeof(struct ip6_frag),
	    ntohs(dp->ip6f_offlg & IP6F_OFF_MASK),
	    (dp->ip6f_offlg & IP6F_MORE_FRAG) ? "+" : "");

	/* it is meaningless to decode non-first fragment */
	if (ntohs(dp->ip6f_offlg & IP6F_OFF_MASK) != 0)
		return 65535;
	else
	{
		printf(" ");
		return sizeof(struct ip6_frag);
	}
trunc:
	printf("[|frag]");
	return 65535;
}