ethernet: Convert mac address uses of 6 to ETH_ALEN

Use the normal #define to help grep find mac addresses
and ensure that addresses are aligned.

pasemi.h has an unaligned access to mac_addr, unchanged
for now.

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Olof Johansson <olof@lixom.net> # pasemi_mac pieces
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/8390/ax88796.c b/drivers/net/ethernet/8390/ax88796.c
index e1d2643..b7232a9 100644
--- a/drivers/net/ethernet/8390/ax88796.c
+++ b/drivers/net/ethernet/8390/ax88796.c
@@ -707,7 +707,7 @@
 
 #ifdef CONFIG_AX88796_93CX6
 	if (ax->plat->flags & AXFLG_HAS_93CX6) {
-		unsigned char mac_addr[6];
+		unsigned char mac_addr[ETH_ALEN];
 		struct eeprom_93cx6 eeprom;
 
 		eeprom.data = ei_local;
@@ -719,7 +719,7 @@
 				       (__le16 __force *)mac_addr,
 				       sizeof(mac_addr) >> 1);
 
-		memcpy(dev->dev_addr, mac_addr, 6);
+		memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
 	}
 #endif
 	if (ax->plat->wordlength == 2) {