added init_ip6pktopts() to initialize packet option structure, which is (currently) called from two parts in ip6_output. this will avoid to forget initializing option info.
added init_ip6pktopts() to initialize packet option structure, which
is (currently) called from two parts in ip6_output.
this will avoid to forget initializing option info.

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