netfilter: decnet: only register hooks in init namespace
looks like decnet isn't namespacified in first place, so restrict hook registration to the initial namespace. Prepares for eventual removal of legacy nf_register_hook() api. Signed-off-by: NFlorian Westphal <fw@strlen.de> Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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