ath5k: Remove unused variable for atim window

It's not used and it's unlikely we will ever implement ATIM.
Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath5k/ath5k.h

@@ -1041,7 +1041,6 @@ struct ath5k_hw {
 #define ah_modes		ah_capabilities.cap_mode
 #define ah_ee_version		ah_capabilities.cap_eeprom.ee_version
 
-	u32			ah_atim_window;
 	u32			ah_limit_tx_retries;
 	u8			ah_coverage_class;
 

drivers/net/wireless/ath/ath5k/attach.c

@@ -118,7 +118,6 @@ int ath5k_hw_attach(struct ath5k_softc *sc)
 	ah->ah_turbo = false;
 	ah->ah_txpower.txp_tpc = AR5K_TUNE_TPC_TXPOWER;
 	ah->ah_imr = 0;
-	ah->ah_atim_window = 0;
 	ah->ah_limit_tx_retries = AR5K_INIT_TX_RETRY;
 	ah->ah_software_retry = false;
 	ah->ah_ant_mode = AR5K_ANTMODE_DEFAULT;

drivers/net/wireless/ath/ath5k/pcu.c

@@ -600,7 +600,7 @@ void ath5k_hw_init_beacon(struct ath5k_hw *ah, u32 next_beacon, u32 interval)
 	/* Timer3 marks the end of our ATIM window
 	 * a zero length window is not allowed because
 	 * we 'll get no beacons */
-	timer3 = next_beacon + (ah->ah_atim_window ? ah->ah_atim_window : 1);
+	timer3 = next_beacon + 1;
 
 	/*
 	 * Set the beacon register and enable all timers.