[Bug 233535] Fix refcount leak in IPv6 MLD code leading to loss of IPv6 connectivity

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233535

--- Comment #43 from Andrey V. Elsukov <ae at FreeBSD.org> ---
(In reply to Hans Petter Selasky from comment #42)
> Created attachment 201221 [details]
> Fix MLD refcounting in IPv6 code (including additional debugging).
> 
> Separate SLIST entries for deferred operation and free, so that they don't
> race.
> Extend epoch to cover all use of inm.

This look like a fix. I will do a deeper test and report again, but from first
look seems now the system does not leaves multicast groups and there is no
memory leak.

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