netdev: use ARRAY_SIZE() instead of sizeof(array) / ETH_GSTRING_LEN

Using ARRAY_SIZE() on arrays of the form array[][K] makes it unnecessary
to know the value of K when checking its size.

Signed-off-by: Alejandro Martinez Ruiz <alex@flawedcode.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c
index c90958f..6bdabc3 100644
--- a/drivers/net/myri10ge/myri10ge.c
+++ b/drivers/net/myri10ge/myri10ge.c
@@ -1431,7 +1431,7 @@
 };
 
 #define MYRI10GE_NET_STATS_LEN      21
-#define MYRI10GE_STATS_LEN  sizeof(myri10ge_gstrings_stats) / ETH_GSTRING_LEN
+#define MYRI10GE_STATS_LEN	ARRAY_SIZE(myri10ge_gstrings_stats)
 
 static void
 myri10ge_get_strings(struct net_device *netdev, u32 stringset, u8 * data)