[NETFILTER] ctnetlink: return -EINVAL if size is wrong

Return -EINVAL if the size isn't OK instead of -EPERM.
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: NHarald Welte <laforge@netfilter.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/netfilter/ip_conntrack_netlink.c

@@ -593,7 +593,7 @@ static int ctnetlink_parse_nat_proto(struct nfattr *attr,
 	nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
 
 	if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
-		return -1;
+		return -EINVAL;
 
 	npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
 	if (!npt)