Fix duplicate acquiring of refcount when joining IPv6 multicast groups.
This was observed by starting and stopping rpcbind(8) multiple times.
PR: 233535
Differential Revision: https://reviews.freebsd.org/D18887
Reviewed by: bz (net)
Tested by: ae
MFC after: 1 week
Sponsored by: Mellanox Technologies
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head/sys/netinet6/in6_mcast.c