netfilter: add and use jump label for xt_tee
Don't bother testing if we need to switch to alternate stack unless TEE target is used. Suggested-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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