iio: adc: qcom-spmi-vadc: use scoped device_for_each_child_node()

Switch to device_for_each_child_node_scoped() to simplify the code by
removing the need for calls to fwnode_handle_put() in the error path.

This prevents possible memory leaks if new error paths are added without
the required call to fwnode_handle_put().

Signed-off-by: Javier Carrasco <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/adc/qcom-spmi-vadc.c

···
 	const struct vadc_channels *vadc_chan;
 	struct iio_chan_spec *iio_chan;
 	struct vadc_channel_prop prop;
-	struct fwnode_handle *child;
 	unsigned int index = 0;
 	int ret;
 
···
 
 	iio_chan = vadc->iio_chans;
 
-	device_for_each_child_node(vadc->dev, child) {
+	device_for_each_child_node_scoped(vadc->dev, child) {
 		ret = vadc_get_fw_channel_data(vadc->dev, &prop, child);
-		if (ret) {
-			fwnode_handle_put(child);
+		if (ret)
 			return ret;
-		}
 
 		prop.scale_fn_type = vadc_chans[prop.channel].scale_fn_type;
 		vadc->chan_props[index] = prop;