iio: use IIO_CHAN_INFO_RAW rather than 0

(a) For better readability, replace 0 with IIO_CHAN_INFO_RAW.
(b) Make same line-format as other apis()
    : iio_read_channel_scale() and iio_read_channel_offset()
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/inkern.c

@@ -239,8 +239,10 @@ int iio_read_channel_raw(struct iio_channel *chan, int *val)
 		goto err_unlock;
 	}
 
-	ret = chan->indio_dev->info->read_raw(chan->indio_dev, chan->channel,
-					      val, &val2, 0);
+	ret = chan->indio_dev->info->read_raw(chan->indio_dev,
+					      chan->channel,
+					      val, &val2,
+					      IIO_CHAN_INFO_RAW);
 err_unlock:
 	mutex_unlock(&chan->indio_dev->info_exist_lock);