iio: Fix fwnode_handle in __fwnode_iio_channel_get_by_name()

In the fwnode_iio_channel_get_by_name(), iterating over parent nodes to
acquire IIO channels via fwnode_for_each_parent_node(). The variable
chan was mistakenly attempted on the original node instead of the
current parent node. This patch corrects the logic to ensure that
__fwnode_iio_channel_get_by_name() is called with the correct parent
node.

Cc: stable@vger.kernel.org # v6.6+
Fixes: 1e64b9c ("iio: inkern: move to fwnode properties")
Signed-off-by: Zicheng Qu <quzicheng@huawei.com>
Link: https://patch.msgid.link/20241102092525.2389952-1-quzicheng@huawei.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Author: Zicheng Qu

drivers/iio/inkern.c

@@ -269,7 +269,7 @@ struct iio_channel *fwnode_iio_channel_get_by_name(struct fwnode_handle *fwnode,
 			return ERR_PTR(-ENODEV);
 		}
 
-		chan = __fwnode_iio_channel_get_by_name(fwnode, name);
+		chan = __fwnode_iio_channel_get_by_name(parent, name);
 		if (!IS_ERR(chan) || PTR_ERR(chan) != -ENODEV) {
 			fwnode_handle_put(parent);
  			return chan;