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/stnic.c b/drivers/net/ethernet/8390/stnic.c
index d85f0a8..3b90375 100644
--- a/drivers/net/ethernet/8390/stnic.c
+++ b/drivers/net/ethernet/8390/stnic.c
@@ -114,7 +114,7 @@
 #ifdef CONFIG_SH_STANDARD_BIOS
   sh_bios_get_node_addr (stnic_eadr);
 #endif
-  for (i = 0; i < ETHER_ADDR_LEN; i++)
+  for (i = 0; i < ETH_ALEN; i++)
     dev->dev_addr[i] = stnic_eadr[i];
 
   /* Set the base address to point to the NIC, not the "real" base! */