* sys/netinet6/ip6_output.c: avoid panic on ip6fw kernel configuration   on IPv6 packet outputs (usually, DAD on reboot).
* sys/netinet6/ip6_output.c: avoid panic on ip6fw kernel configuration
  on IPv6 packet outputs (usually, DAD on reboot).

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