* sys/netinet6/frag6.c: be LP64 environment friendly.  do not reuse   ip6 header portion on reassembly.
* sys/netinet6/frag6.c: be LP64 environment friendly.  do not reuse
  ip6 header portion on reassembly.

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