udp: Simplify __udp*_lib_mcast_deliver.
Switch to using sk_nulls_for_each which shortens the code and makes it easier to update. Signed-off-by: David Held <drheld@google.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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