The commits below have not been added to stable/14. They have been known to fix IGMP leave
messages which are currently broken on both 14.0 and 14.1.
Revert "mcast: fix memory leak in imf_purge()"
This reverts commit fa03d37432caf17d56a931a9e6f5d9b06f102c5b.
This commit caused us to not send IGMP leave messages if the inpcb went
away. In other words: we freed pending packets whenever the socket
closed rather than when the interface (or address) goes away.
mcast: fix leaked igmp packets on multicast cleanup
When we release a multicast address (e.g. on interface shutdown) we may
still have packets queued in inm_scq. We have to free those, or we'll
leak memory.