X25: Use identifiers for hdlc x25 device to x25 interface

Change magic numbers to identifiers for X25 interface.
Signed-off-by: Andrew Hendry <andrew.hendry@gmail.com>
Acked-by: Krzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/wan/hdlc_x25.c

@@ -49,14 +49,14 @@ static void x25_connect_disconnect(struct net_device *dev, int reason, int code)
 
 static void x25_connected(struct net_device *dev, int reason)
 {
-	x25_connect_disconnect(dev, reason, 1);
+	x25_connect_disconnect(dev, reason, X25_IFACE_CONNECT);
 }
 
 
 
 static void x25_disconnected(struct net_device *dev, int reason)
 {
-	x25_connect_disconnect(dev, reason, 2);
+	x25_connect_disconnect(dev, reason, X25_IFACE_DISCONNECT);
 }
 
 
@@ -71,7 +71,7 @@ static int x25_data_indication(struct net_device *dev, struct sk_buff *skb)
 		return NET_RX_DROP;
 
 	ptr  = skb->data;
-	*ptr = 0;
+	*ptr = X25_IFACE_DATA;
 
 	skb->protocol = x25_type_trans(skb, dev);
 	return netif_rx(skb);
@@ -94,13 +94,13 @@ static netdev_tx_t x25_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	/* X.25 to LAPB */
 	switch (skb->data[0]) {
-	case 0:		/* Data to be transmitted */
+	case X25_IFACE_DATA:	/* Data to be transmitted */
 		skb_pull(skb, 1);
 		if ((result = lapb_data_request(dev, skb)) != LAPB_OK)
 			dev_kfree_skb(skb);
 		return NETDEV_TX_OK;
 
-	case 1:
+	case X25_IFACE_CONNECT:
 		if ((result = lapb_connect_request(dev))!= LAPB_OK) {
 			if (result == LAPB_CONNECTED)
 				/* Send connect confirm. msg to level 3 */
@@ -112,7 +112,7 @@ static netdev_tx_t x25_xmit(struct sk_buff *skb, struct net_device *dev)
 		}
 		break;
 
-	case 2:
+	case X25_IFACE_DISCONNECT:
 		if ((result = lapb_disconnect_request(dev)) != LAPB_OK) {
 			if (result == LAPB_NOTCONNECTED)
 				/* Send disconnect confirm. msg to level 3 */