* sys/netinet6/in6_ifattach.c: cleanup IPv6 interface initialization   in in6_ifattach().  be more persistent about initialization.
* sys/netinet6/in6_ifattach.c: cleanup IPv6 interface initialization
  in in6_ifattach().  be more persistent about initialization.

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