netfilter: nf_tables_offload: restore basechain deletion

Unbind callbacks on chain deletion.

Fixes: 8fc618c5 ("netfilter: nf_tables_offload: refactor the nft_flow_offload_chain function")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nf_tables_offload.c

@@ -347,7 +347,7 @@ int nft_flow_rule_offload_commit(struct net *net)
 
 			policy = nft_trans_chain_policy(trans);
 			err = nft_flow_offload_chain(trans->ctx.chain, &policy,
-						     FLOW_BLOCK_BIND);
+						     FLOW_BLOCK_UNBIND);
 			break;
 		case NFT_MSG_NEWRULE:
 			if (!(trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD))