netfilter: nf_tables_offload: return EOPNOTSUPP if rule specifies no actions
If the rule only specifies the matching side, return EOPNOTSUPP. Otherwise, the front-end relies on the drivers to reject this rule. Fixes: c9626a2c ("netfilter: nf_tables: add hardware offload support") Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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