ath9k: remove prototype for ath9k_regd_get_current_country

ath9k_regd_get_current_country() doesn't exist.
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Acked-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath9k/regd.h

@@ -242,7 +242,5 @@ int ath9k_regd_init(struct ath_hw *ah);
 bool ath9k_regd_is_eeprom_valid(struct ath_hw *ah);
 u32 ath9k_regd_get_ctl(struct ath_hw *ah, struct ath9k_channel *chan);
 int ath9k_reg_notifier(struct wiphy *wiphy, struct regulatory_request *request);
-void ath9k_regd_get_current_country(struct ath_hw *ah,
-				    struct ath9k_country_entry *ctry);
 
 #endif