fix memory leak.     from freebsd-current in6_pcb.c:rev 1.19->1.20         http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet6/in6_pcb.c.diff?r1=1.19&r2=1.20     you can also see detail description in in_pcb.c:rev 1.84->1.85 	http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet/in_pcb.c
fix memory leak.
    from freebsd-current in6_pcb.c:rev 1.19->1.20
        http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet6/in6_pcb.c.diff?r1=1.19&r2=1.20
    you can also see detail description in in_pcb.c:rev 1.84->1.85
	http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet/in_pcb.c

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame