iio: core: fix memleak in iio_device_register_sysfs

When iio_device_register_sysfs_group() fails, we should
free iio_dev_opaque->chan_attr_group.attrs to prevent
potential memleak.

Fixes: 32f1717 ("iio: core: rework iio device group creation")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
Link: https://lore.kernel.org/r/20231208073119.29283-1-dinghao.liu@zju.edu.cn
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Author: dinghaoliu

drivers/iio/industrialio-core.c

@@ -1584,10 +1584,13 @@ static int iio_device_register_sysfs(struct iio_dev *indio_dev)
 	ret = iio_device_register_sysfs_group(indio_dev,
 					      &iio_dev_opaque->chan_attr_group);
 	if (ret)
-		goto error_clear_attrs;
+		goto error_free_chan_attrs;
 
 	return 0;
 
+error_free_chan_attrs:
+	kfree(iio_dev_opaque->chan_attr_group.attrs);
+	iio_dev_opaque->chan_attr_group.attrs = NULL;
 error_clear_attrs:
 	iio_free_chan_devattr_list(&iio_dev_opaque->channel_attr_list);