ath9k: remove write-only current_rd_inuse

The current_rd_inuse regulatory value is assigned but not used anywhere.
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.c

@@ -433,7 +433,6 @@ int ath9k_regd_init(struct ath_hw *ah)
 			regdmn = country->regDmnEnum;
 	}
 
-	ah->regulatory.current_rd_inuse = regdmn;
 	ah->regulatory.regpair = ath9k_get_regpair(regdmn);
 
 	if (!ah->regulatory.regpair) {

drivers/net/wireless/ath9k/regd.h

@@ -52,7 +52,6 @@ struct ath9k_regulatory {
 	u32 tp_scale;
 	u16 current_rd;
 	u16 current_rd_ext;
-	u16 current_rd_inuse;
 	int16_t power_limit;
 	struct reg_dmn_pair_mapping *regpair;
 };