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netfilter: conntrack: move expect counter to net_generic data
Creation of a new conntrack entry isn't a frequent operation (compared
to 'ct entry already exists'). Creation of a new entry that is also an
expected (related) connection even less so.
Place this counter in net_generic data.
A followup patch will also move the conntrack count -- this will make
netns_ct a read-mostly structure.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>