netfilter: nf_tables_offload: add nft_flow_block_chain()

Add nft_flow_block_chain() helper function to reuse this function from
netdev event handler.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2019-10-16 14:29:52 +02:00
commit ead3952ea7