staging: rtl8192e: Remove u4RegValue which is always zero

As the array antenna_tx_pwr_diff is always zero, u4RegValue is always set
to zero. Replace u4RegValue to avoid CamelCase which is not accepted by
checkpatch.
Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/2aa104c0f7a5cede7eea289fe92390295592b0e9.1674244819.git.philipp.g.hortmann@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192e/rtl8192e/r8192E_phy.c

@@ -586,7 +586,6 @@ void rtl92e_set_tx_power(struct net_device *dev, u8 channel)
 {
 	struct r8192_priv *priv = rtllib_priv(dev);
 	u8	powerlevel = 0, powerlevelOFDM24G = 0;
-	u32	u4RegValue;
 
 	if (priv->epromtype == EEPROM_93C46) {
 		powerlevel = priv->tx_pwr_level_cck[channel - 1];
@@ -603,13 +602,8 @@ void rtl92e_set_tx_power(struct net_device *dev, u8 channel)
 			priv->antenna_tx_pwr_diff[1] = 0;
 			priv->antenna_tx_pwr_diff[0] = 0;
 
-			u4RegValue = priv->antenna_tx_pwr_diff[2] << 8 |
-				      priv->antenna_tx_pwr_diff[1] << 4 |
-				      priv->antenna_tx_pwr_diff[0];
-
 			rtl92e_set_bb_reg(dev, rFPGA0_TxGainStage,
-					  (bXBTxAGC|bXCTxAGC|bXDTxAGC),
-					  u4RegValue);
+					  (bXBTxAGC | bXCTxAGC | bXDTxAGC), 0);
 		}
 	}
 	switch (priv->rf_chip) {