ath9k: use ether_addr_equal_64bits

Ether_addr_equal_64bits is more efficient than ether_addr_equal, and can be
used when each argument is an array within a structure that contains at
least two bytes of data beyond the array.

The structures involved are:
ieee80211_hdr defined in include/linux/ieee80211.h
ath_common defined in drivers/net/wireless/ath/ath.h

This was done using Coccinelle (http://coccinelle.lip6.fr/).

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
index 470e1c0..01c41c6 100644
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -982,7 +982,7 @@
 	if (ieee80211_is_beacon(hdr->frame_control)) {
 		RX_STAT_INC(rx_beacons);
 		if (!is_zero_ether_addr(common->curbssid) &&
-		    ether_addr_equal(hdr->addr3, common->curbssid))
+		    ether_addr_equal_64bits(hdr->addr3, common->curbssid))
 			return true;
 	}