ath9k_htc: Handle CONF_IDLE during unassociated state to save power.

Signed-off-by: Vivek Natarajan <vnatarajan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/htc.h b/drivers/net/wireless/ath/ath9k/htc.h
index b771e20..1ae18bb 100644
--- a/drivers/net/wireless/ath/ath9k/htc.h
+++ b/drivers/net/wireless/ath/ath9k/htc.h
@@ -379,6 +379,7 @@
 	struct mutex htc_pm_lock;
 	unsigned long ps_usecount;
 	bool ps_enabled;
+	bool ps_idle;
 
 	struct ath_led radio_led;
 	struct ath_led assoc_led;