netfilter: conntrack: remove unused init_net hook
since adf05168 ("netfilter: remove ip_conntrack* sysctl compat code") the only user (ipv4 tracker) sets this to an empty stub function. After this change nf_ct_l3proto_pernet_register() is also empty, but this will change in a followup patch to add conditional register of the hooks. Signed-off-by: NFlorian Westphal <fw@strlen.de> Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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