rtlwifi: rtl8192cu: remove set but not used variable 'turbo_scanoff'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/net/wireless/realtek/rtlwifi/rtl8192cu/rf.c: In function 'rtl92cu_phy_rf6052_set_cck_txpower':
drivers/net/wireless/realtek/rtlwifi/rtl8192cu/rf.c:45:7: warning: variable 'turbo_scanoff' set but not used [-Wunused-but-set-variable]

It is not used any more since
commit e9b0784b ("rtlwifi: rtl8192cu: Fix some code in RF handling")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/realtek/rtlwifi/rtl8192cu/rf.c

@@ -42,12 +42,9 @@ void rtl92cu_phy_rf6052_set_cck_txpower(struct ieee80211_hw *hw,
 	struct rtl_mac *mac = rtl_mac(rtl_priv(hw));
 	struct rtl_efuse *rtlefuse = rtl_efuse(rtl_priv(hw));
 	u32 tx_agc[2] = { 0, 0 }, tmpval = 0;
-	bool turbo_scanoff = false;
 	u8 idx1, idx2;
 	u8 *ptr;
 
-	if ((rtlefuse->eeprom_regulatory != 0) || (rtlefuse->external_pa))
-		turbo_scanoff = true;
 	if (mac->act_scanning) {
 		tx_agc[RF90_PATH_A] = 0x3f3f3f3f;
 		tx_agc[RF90_PATH_B] = 0x3f3f3f3f;