ath9k_hw: remove warning in ath9k_hw_def_get_num_ant_config

This patch fixes following warning

drivers/net/wireless/ath/ath9k/eeprom_def.c: In function 'ath9k_hw_def_get_num_ant_config'
drivers/net/wireless/ath/ath9k/eeprom_def.c:1425:47: warning: comparison
			between 'enum ath9k_hal_freq_band' and 'enum ieee80211_band'

Signed-off-by: Rajkumar Manoharan <rmanoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/eeprom_def.c b/drivers/net/wireless/ath/ath9k/eeprom_def.c
index afa2b73..23f480d 100644
--- a/drivers/net/wireless/ath/ath9k/eeprom_def.c
+++ b/drivers/net/wireless/ath/ath9k/eeprom_def.c
@@ -1418,11 +1418,11 @@
 }
 
 static u8 ath9k_hw_def_get_num_ant_config(struct ath_hw *ah,
-					  enum ieee80211_band freq_band)
+					  enum ath9k_hal_freq_band freq_band)
 {
 	struct ar5416_eeprom_def *eep = &ah->eeprom.def;
 	struct modal_eep_header *pModal =
-		&(eep->modalHeader[ATH9K_HAL_FREQ_BAND_2GHZ == freq_band]);
+		&(eep->modalHeader[freq_band]);
 	struct base_eep_header *pBase = &eep->baseEepHeader;
 	u8 num_ant_config;