Merge branch 'bridge-mcast-fixes'

Nikolay Aleksandrov says:

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net: bridge: mcast: fixes for mcast querier state

These three fix querier state dumping. The first patch can be considered
a minor behaviour improvement, it avoids dumping querier state when mcast
snooping is disabled. The second patch was a report of sizeof(0) used
for nested netlink attribute size which should be just 0, and the third
patch accounts for IPv6 querier state size when allocating skb for
notifications.
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Signed-off-by: David S. Miller <davem@davemloft.net>