nf_conntrack_proto_generic: 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: NDavid S. Miller <davem@davemloft.net>

net/netfilter/nf_conntrack_proto_generic.c

@@ -90,7 +90,8 @@ generic_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
 {
 	const unsigned int *timeout = data;
 
-	NLA_PUT_BE32(skb, CTA_TIMEOUT_GENERIC_TIMEOUT, htonl(*timeout / HZ));
+	if (nla_put_be32(skb, CTA_TIMEOUT_GENERIC_TIMEOUT, htonl(*timeout / HZ)))
+		goto nla_put_failure;
 
 	return 0;