bcm63xx_enet: Use ARRAY_SIZE instead of open coding it

Use the ARRAY_SIZE macro to determine the number of entries in
bcm_enet_gstrings_stats.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bcm63xx_enet.c

@@ -1315,8 +1315,7 @@ static const struct bcm_enet_stats bcm_enet_gstrings_stats[] = {
 
 };
 
-#define BCM_ENET_STATS_LEN	\
-	(sizeof(bcm_enet_gstrings_stats) / sizeof(struct bcm_enet_stats))
+#define BCM_ENET_STATS_LEN	ARRAY_SIZE(bcm_enet_gstrings_stats)
 
 static const u32 unused_mib_regs[] = {
 	ETH_MIB_TX_ALL_OCTETS,