iio: light: noa1305: Simplify noa1305_read_raw()

The only channel this hardware supports is IIO_LIGHT, if the channel
is anything else, exit right away. The 'ret' variable is now always
only assigned by noa1305_measure(), do not initialize it anymore.
Update function parameter indent. No functional change.
Signed-off-by: Marek Vasut <marex@denx.de>
Link: https://patch.msgid.link/20240715183120.143417-1-marex@denx.deSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/light/noa1305.c

@@ -125,38 +125,27 @@ static const struct iio_chan_spec noa1305_channels[] = {
 };
 
 static int noa1305_read_raw(struct iio_dev *indio_dev,
-				struct iio_chan_spec const *chan,
-				int *val, int *val2, long mask)
+			    struct iio_chan_spec const *chan,
+			    int *val, int *val2, long mask)
 {
-	int ret = -EINVAL;
 	struct noa1305_priv *priv = iio_priv(indio_dev);
+	int ret;
+
+	if (chan->type != IIO_LIGHT)
+		return -EINVAL;
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
-		switch (chan->type) {
-		case IIO_LIGHT:
-			ret = noa1305_measure(priv);
-			if (ret < 0)
-				return ret;
-			*val = ret;
-			return IIO_VAL_INT;
-		default:
-			break;
-		}
-		break;
+		ret = noa1305_measure(priv);
+		if (ret < 0)
+			return ret;
+		*val = ret;
+		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_SCALE:
-		switch (chan->type) {
-		case IIO_LIGHT:
-			return noa1305_scale(priv, val, val2);
-		default:
-			break;
-		}
-		break;
+		return noa1305_scale(priv, val, val2);
 	default:
-		break;
+		return -EINVAL;
 	}
-
-	return ret;
 }
 
 static const struct iio_info noa1305_info = {