nf_conntrack_proto_gre: Stop using NLA_PUT*().

These macros contain a hidden goto, and are thus extremely error
prone and make code hard to audit.

Signed-off-by: David S. Miller <davem@davemloft.net>

net/netfilter/nf_conntrack_proto_gre.c

@@ -321,10 +321,11 @@ gre_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
 {
 	const unsigned int *timeouts = data;
 
-	NLA_PUT_BE32(skb, CTA_TIMEOUT_GRE_UNREPLIED,
-			htonl(timeouts[GRE_CT_UNREPLIED] / HZ));
-	NLA_PUT_BE32(skb, CTA_TIMEOUT_GRE_REPLIED,
-			htonl(timeouts[GRE_CT_REPLIED] / HZ));
+	if (nla_put_be32(skb, CTA_TIMEOUT_GRE_UNREPLIED,
+			 htonl(timeouts[GRE_CT_UNREPLIED] / HZ)) ||
+	    nla_put_be32(skb, CTA_TIMEOUT_GRE_REPLIED,
+			 htonl(timeouts[GRE_CT_REPLIED] / HZ)))
+		goto nla_put_failure;
 	return 0;
 
 nla_put_failure: