ath9k: Cleanup ineffective return values

This patch makes the return type of some of the functions
void as those functions always return true

Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/phy.c b/drivers/net/wireless/ath/ath9k/phy.c
index 5ec9ce9..aaa9415 100644
--- a/drivers/net/wireless/ath/ath9k/phy.c
+++ b/drivers/net/wireless/ath/ath9k/phy.c
@@ -96,9 +96,8 @@
 	return true;
 }
 
-bool
-ath9k_hw_ar9280_set_channel(struct ath_hw *ah,
-			    struct ath9k_channel *chan)
+void ath9k_hw_ar9280_set_channel(struct ath_hw *ah,
+				 struct ath9k_channel *chan)
 {
 	u16 bMode, fracMode, aModeRefSel = 0;
 	u32 freq, ndiv, channelSel = 0, channelFrac = 0, reg32 = 0;
@@ -169,8 +168,6 @@
 
 	ah->curchan = chan;
 	ah->curchan_rad_index = -1;
-
-	return true;
 }
 
 static void