net: hdlc_ppp: remove unnecessary out of memory message

This patch removes unnecessary out of memory message,
to fix the following checkpatch.pl warning:
"WARNING: Possible unnecessary 'out of memory' message"
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/wan/hdlc_ppp.c

@@ -219,10 +219,9 @@ static void ppp_tx_cp(struct net_device *dev, u16 pid, u8 code,
 
 	skb = dev_alloc_skb(sizeof(struct hdlc_header) +
 			    sizeof(struct cp_header) + magic_len + len);
-	if (!skb) {
-		netdev_warn(dev, "out of memory in ppp_tx_cp()\n");
+	if (!skb)
 		return;
-	}
+
 	skb_reserve(skb, sizeof(struct hdlc_header));
 
 	cp = skb_put(skb, sizeof(struct cp_header));