ath: do not update cycle counters with sleep mode

When the chip is waking up from sleep state, the cycle counters
might have incorrect readings. So it is better not to update those
readings with software counters.

Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index d739c8e..623b04f6 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -101,6 +101,7 @@
 		spin_lock(&common->cc_lock);
 		ath_hw_cycle_counters_update(common);
 		memset(&common->cc_survey, 0, sizeof(common->cc_survey));
+		memset(&common->cc_ani, 0, sizeof(common->cc_ani));
 		spin_unlock(&common->cc_lock);
 	}