netfilter: nf_log: don't call synchronize_rcu in nf_log_unset
nf_log_unregister() (which is what gets called in the logger backends module exit paths) does a (required, module is removed) synchronize_rcu(). But nf_log_unset() is only called from pernet exit handlers. It doesn't free any memory so there appears to be no need to call synchronize_rcu. v2: Liping Zhang points out that nf_log_unregister() needs to be called after pernet unregister, else rmmod would become unsafe. Signed-off-by: NFlorian Westphal <fw@strlen.de> Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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