netfilter: conntrack: free extension area immediately
Instead of waiting for rcu grace period just free it directly. This is safe because conntrack lookup doesn't consider extensions. Other accesses happen while ct->ext can't be free'd, either because a ct refcount was taken or because the conntrack hash bucket lock or the dying list spinlock have been taken. This allows to remove __krealloc in a followup patch, netfilter was the only user. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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