iio: accel: adxl367: unlock on error in adxl367_buffer_predisable()

This error path needs to call the mutex_unlock(&st->lock) before
returning.

Fixes: cbab791c ("iio: accel: add ADXL367 driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Cosmin Tanislav <cosmin.tanislav@analog.com>
Link: https://lore.kernel.org/r/20220224150228.GB6856@kiliSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/accel/adxl367.c

@@ -1359,7 +1359,7 @@ static int adxl367_buffer_predisable(struct iio_dev *indio_dev)
 
 	ret = adxl367_set_measure_en(st, true);
 	if (ret)
-		return ret;
+		goto out;
 
 	ret = adxl367_set_temp_adc_mask_en(st, indio_dev->active_scan_mask,
 					   false);