e1000e: magic number cleanup - ETH_ALEN

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/e1000e/hw.h b/drivers/net/e1000e/hw.h
index bc0860a..307e1ec 100644
--- a/drivers/net/e1000e/hw.h
+++ b/drivers/net/e1000e/hw.h
@@ -812,9 +812,8 @@
 
 struct e1000_mac_info {
 	struct e1000_mac_operations ops;
-
-	u8 addr[6];
-	u8 perm_addr[6];
+	u8 addr[ETH_ALEN];
+	u8 perm_addr[ETH_ALEN];
 
 	enum e1000_mac_type type;