staging: r8188eu: Remove self assignment in get_rx_power_val_by_reg()

Clang warns:

drivers/staging/r8188eu/hal/rtl8188e_rf6052.c:344:13: warning:
explicitly assigning value of variable of type 'u32' (aka 'unsigned
int') to itself [-Wself-assign]
                        writeVal = writeVal;
                        ~~~~~~~~ ^ ~~~~~~~~
1 warning generated.

Remove this branch as it is useless.
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20210805185807.3296077-3-nathan@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/hal/rtl8188e_rf6052.c

@@ -340,8 +340,6 @@ static void get_rx_power_val_by_reg(struct adapter *Adapter, u8 Channel,
 		/*  This mechanism is only applied when Driver-Highpower-Mechanism is OFF. */
 		if (pdmpriv->DynamicTxHighPowerLvl == TxHighPwrLevel_BT1)
 			writeVal = writeVal - 0x06060606;
-		else if (pdmpriv->DynamicTxHighPowerLvl == TxHighPwrLevel_BT2)
-			writeVal = writeVal;
 		*(pOutWriteVal+rf) = writeVal;
 	}
 }