netfilter: nf_tables: add nft_unregister_flowtable_hook()
Unbind flowtable callback if hook is unregistered. This patch is implicitly fixing the error path of nf_tables_newflowtable() and nft_flowtable_event(). Fixes: 8bb69f3b ("netfilter: nf_tables: add flowtable offload control plane") Reported-by: wenxu <wenxu@ucloud.cn> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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