netfilter: nfnetlink: add and use nfnetlink_broadcast
This removes the only reference of net->nfnl outside of the nfnetlink module. This allows to move net->nfnl to net_generic infra. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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