decnet: dn_rtmsg: Move away from NLMSG_PUT().

And use nlmsg_data() while we're here too.

Also, remove pointless kernel log message.
Signed-off-by: David S. Miller <davem@davemloft.net>

net/decnet/netfilter/dn_rtmsg.c

@@ -42,23 +42,23 @@ static struct sk_buff *dnrmg_build_message(struct sk_buff *rt_skb, int *errp)
 	size = NLMSG_SPACE(rt_skb->len);
 	size += NLMSG_ALIGN(sizeof(struct nf_dn_rtmsg));
 	skb = alloc_skb(size, GFP_ATOMIC);
-	if (!skb)
-		goto nlmsg_failure;
+	if (!skb) {
+		*errp = -ENOMEM;
+		return NULL;
+	}
 	old_tail = skb->tail;
-	nlh = NLMSG_PUT(skb, 0, 0, 0, size - sizeof(*nlh));
+	nlh = nlmsg_put(skb, 0, 0, 0, size - sizeof(*nlh), 0);
+	if (!nlh) {
+		kfree_skb(skb);
+		*errp = -ENOMEM;
+		return NULL;
+	}
 	rtm = (struct nf_dn_rtmsg *)NLMSG_DATA(nlh);
 	rtm->nfdn_ifindex = rt_skb->dev->ifindex;
 	ptr = NFDN_RTMSG(rtm);
 	skb_copy_from_linear_data(rt_skb, ptr, rt_skb->len);
 	nlh->nlmsg_len = skb->tail - old_tail;
 	return skb;
-
-nlmsg_failure:
-	if (skb)
-		kfree_skb(skb);
-	*errp = -ENOMEM;
-	net_err_ratelimited("dn_rtmsg: error creating netlink message\n");
-	return NULL;
 }
 
 static void dnrmg_send_peer(struct sk_buff *skb)