ath5k: Wakeup fixes

* Don't put chip to full sleep because there are problems during
   wakeup. Instead hold MAC/Baseband on warm reset state via a new
   function ath5k_hw_on_hold.

 * Minor cleanups

Signed-off-by: Nick Kossifidis <mickflemm@gmail.com>
Tested-by: Ben Greear <greearb@candelatech.com>
Tested-by: Johannes Stezenbach <js@sig21.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath5k/attach.c b/drivers/net/wireless/ath/ath5k/attach.c
index 6263065..238eeb7 100644
--- a/drivers/net/wireless/ath/ath5k/attach.c
+++ b/drivers/net/wireless/ath/ath5k/attach.c
@@ -145,7 +145,7 @@
 		goto err_free;
 
 	/* Bring device out of sleep and reset it's units */
-	ret = ath5k_hw_nic_wakeup(ah, CHANNEL_B, true);
+	ret = ath5k_hw_nic_wakeup(ah, 0, true);
 	if (ret)
 		goto err_free;