iio: adc: ti-ads131e08: add missing fwnode_handle_put() in ads131e08_alloc_channels()

iio: adc: ti-ads131e08: add missing fwnode_handle_put() in ads131e08_alloc_channels()

fwnode_handle_put() should be used when terminating
device_for_each_child_node() iteration with break or return to prevent
stale device node references from being left behind.

Fixes: d935eddd2799 ("iio: adc: Add driver for Texas Instruments ADS131E0x ADC family")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>
Link: https://lore.kernel.org/r/20220517033020.2033324-1-zhangjialin11@huawei.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>