ethernet: Convert ETHER_ADDR_LEN uses to ETH_ALEN

Reduce the number of #defines, use the normal #define from if_ether.h

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/8390/ne2.c b/drivers/net/ethernet/8390/ne2.c
index 70cdc69..922b320 100644
--- a/drivers/net/ethernet/8390/ne2.c
+++ b/drivers/net/ethernet/8390/ne2.c
@@ -460,7 +460,7 @@
 
 	dev->base_addr = base_addr;
 
-	for(i = 0; i < ETHER_ADDR_LEN; i++)
+	for (i = 0; i < ETH_ALEN; i++)
 		dev->dev_addr[i] = SA_prom[i];
 
 	printk(" %pM\n", dev->dev_addr);