iio: adc: ti-ads131e08: Use device_for_each_child_node_scoped() to simplify error...

iio: adc: ti-ads131e08: Use device_for_each_child_node_scoped() to simplify error paths.

This loop definition automatically releases the handle on early exit
reducing the chance of bugs that cause resource leaks.

Co-developed-by: Briza Mel Dias de Sousa <brizamel.dias@usp.br>
Signed-off-by: Briza Mel Dias de Sousa <brizamel.dias@usp.br>
Signed-off-by: Lorenzo Bertin Salvador <lorenzobs@usp.br>
Link: https://lore.kernel.org/r/20240420182744.153184-2-lorenzobs@usp.br
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>