netfilter: add nf_hook_list_active()
In preparation to have netfilter ingress per-device hook list. Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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In preparation to have netfilter ingress per-device hook list. Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>