Pull up following revision(s) (requested by maxv in ticket #530):
sys/netinet6/ip6_mroute.c: revision 1.120
Fix a pretty simple, yet pretty tragic typo: we should return IPPROTO_DONE,
not IPPROTO_NONE. With IPPROTO_NONE we will keep parsing the header chain
on an mbuf that was already freed.

(martin)