It seems more readable to use a common helper in the followup fix rather
than copypaste or goto.

No functional change intended.  The function is only called for syn-ack
or syn in repy direction in case of simultaneous open.
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Jozsef Kadlecsik <kadlec@netfilter.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>