rtlwifi: rtl8188ee: Remove set but unused variable 'reg_ea4'

Fixes the following W=1 kernel build warning(s):

 drivers/net/wireless/realtek/rtlwifi/rtl8188ee/phy.c: In function ‘_rtl88e_phy_path_a_iqk’:
 drivers/net/wireless/realtek/rtlwifi/rtl8188ee/phy.c:1351:33: warning: variable ‘reg_ea4’ set but not used [-Wunused-but-set-variable]

Cc: Ping-Ke Shih <pkshih@realtek.com>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Larry Finger <Larry.Finger@lwfinger.net>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20201102112410.1049272-30-lee.jones@linaro.org

drivers/net/wireless/realtek/rtlwifi/rtl8188ee/phy.c

@@ -1348,7 +1348,7 @@ static bool _rtl88e_phy_set_sw_chnl_cmdarray(struct swchnlcmd *cmdtable,
 
 static u8 _rtl88e_phy_path_a_iqk(struct ieee80211_hw *hw, bool config_pathb)
 {
-	u32 reg_eac, reg_e94, reg_e9c, reg_ea4;
+	u32 reg_eac, reg_e94, reg_e9c;
 	u8 result = 0x00;
 
 	rtl_set_bbreg(hw, 0xe30, MASKDWORD, 0x10008c1c);
@@ -1365,7 +1365,7 @@ static u8 _rtl88e_phy_path_a_iqk(struct ieee80211_hw *hw, bool config_pathb)
 	reg_eac = rtl_get_bbreg(hw, 0xeac, MASKDWORD);
 	reg_e94 = rtl_get_bbreg(hw, 0xe94, MASKDWORD);
 	reg_e9c = rtl_get_bbreg(hw, 0xe9c, MASKDWORD);
-	reg_ea4 = rtl_get_bbreg(hw, 0xea4, MASKDWORD);
+	rtl_get_bbreg(hw, 0xea4, MASKDWORD);
 
 	if (!(reg_eac & BIT(28)) &&
 	    (((reg_e94 & 0x03FF0000) >> 16) != 0x142) &&