netfilter: nf_conncount: fix leaked ct in error paths

netfilter: nf_conncount: fix leaked ct in error paths

[ Upstream commit 2e2a720766886190a6d35c116794693aabd332b6 ]

There are some situations where ct might be leaked as error paths are
skipping the refcounted check and return immediately. In order to solve
it make sure that the check is always called.

Fixes: be102eb6a0e7 ("netfilter: nf_conncount: rework API to use sk_buff directly")
Signed-off-by: Fernando Fernandez Mancera <fmancera@suse.de>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>