ath9k_hw: ar9002_hw_spectral_scan_config() can be static

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/ar9002_phy.c b/drivers/net/wireless/ath/ath9k/ar9002_phy.c
index 2cb665e..f400351 100644
--- a/drivers/net/wireless/ath/ath9k/ar9002_phy.c
+++ b/drivers/net/wireless/ath/ath9k/ar9002_phy.c
@@ -555,7 +555,7 @@
 	REG_WRITE(ah, AR_PHY_MULTICHAIN_GAIN_CTL, regval);
 }
 
-void ar9002_hw_spectral_scan_config(struct ath_hw *ah,
+static void ar9002_hw_spectral_scan_config(struct ath_hw *ah,
 				    struct ath_spec_scan *param)
 {
 	u8 count;