netfilter: nat: avoid use of nf_conn_nat extension
successful insert into the bysource hash sets IPS_SRC_NAT_DONE status bit so we can check that instead of presence of nat extension which requires extra deref. Signed-off-by: NFlorian Westphal <fw@strlen.de> Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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