iio: stmpe-adc: Remove unnecessary assignment

Remove unnecessary assignment. This could potentially cause an issue, if
the wait function runs into a timeout. Furthermore is this assignment also
not there in stmpe_read_temp()
Signed-off-by: NPhilippe Schenker <philippe.schenker@toradex.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/stmpe-adc.c

@@ -78,8 +78,6 @@ static int stmpe_read_voltage(struct stmpe_adc *info,
 	stmpe_reg_write(info->stmpe, STMPE_REG_ADC_CAPT,
 			STMPE_ADC_CH(info->channel));
 
-	*val = info->value;
-
 	ret = wait_for_completion_interruptible_timeout
 		(&info->completion, STMPE_ADC_TIMEOUT);