[AX25] Introduce ax25_type_trans

Replacing the open coded equivalents and making ax25 look more like
a linux network protocol, i.e. more similar to inet.

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/hamradio/scc.c b/drivers/net/hamradio/scc.c
index ce9e7af..ece1b1a1 100644
--- a/drivers/net/hamradio/scc.c
+++ b/drivers/net/hamradio/scc.c
@@ -1630,10 +1630,7 @@
 	scc->dev_stat.rx_packets++;
 	scc->dev_stat.rx_bytes += skb->len;
 
-	skb->dev      = scc->dev;
-	skb->protocol = htons(ETH_P_AX25);
-	skb->mac.raw  = skb->data;
-	skb->pkt_type = PACKET_HOST;
+	skb->protocol = ax25_type_trans(skb, scc->dev);
 	
 	netif_rx(skb);
 	scc->dev->last_rx = jiffies;