netfilter: nf_tables: skip synchronize_rcu if transaction log is empty
After processing the transaction log, the remaining entries of the log need to be released. However, in some cases no entries remain, e.g. because the transaction did not remove anything. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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