[Bug 242677] multicast: setsockopt(...IP_DROP_MEMBERSHIP...) doesn't lead to sending IGMP packet.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242677

--- Comment #7 from commit-hook at freebsd.org ---
A commit references this bug:

Author: hselasky
Date: Wed Dec 18 12:06:35 UTC 2019
New revision: 355881
URL: https://svnweb.freebsd.org/changeset/base/355881

Log:
  Leave multicast group before reaping and committing state for both
  IPv4 and IPv6.

  This fixes a regression issue after r349369. When trying to exit a
  multicast group before closing the socket, a multicast leave packet
  should be sent.

  Differential Revision:        https://reviews.freebsd.org/D22848
  PR: 242677
  Reviewed by:  bz (network)
  Tested by:    Aleksandr Fedorov <aleksandr.fedorov at itglobal.com>
  MFC after:    1 week
  Sponsored by: Mellanox Technologies

Changes:
  head/sys/netinet/in_mcast.c
  head/sys/netinet6/in6_mcast.c

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