netfilter: core: batch nf_unregister_net_hooks synchronize_net calls
re-add batching in nf_unregister_net_hooks(). Similar as before, just store an array with to-be-free'd rule arrays on stack, then call synchronize_net once per batch. Signed-off-by: NFlorian Westphal <fw@strlen.de> Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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