netfilter: nfnetlink: Report extack policy errors for batched ops

The nftables batch processing does not currently populate extack with
policy errors. Fix this by passing extack when parsing batch messages.

Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Author: donaldh

net/netfilter/nfnetlink.c

@@ -517,7 +517,7 @@ static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh,
 			err = nla_parse_deprecated(cda,
 						   ss->cb[cb_id].attr_count,
 						   attr, attrlen,
-						   ss->cb[cb_id].policy, NULL);
+						   ss->cb[cb_id].policy, &extack);
 			if (err < 0)
 				goto ack;