iio: adc: berlin2-adc: Add missing of_node_put() in error path

iio: adc: berlin2-adc: Add missing of_node_put() in error path

commit a8af13ece008b622b1e4c7ebca16f9689ae4c19d upstream.

of_get_parent() will return a device_node pointer with refcount
incremented. We need to use of_node_put() on it when done. Add the
missing of_node_put() in the error path of berlin2_adc_probe();

Fixes: fce5fdffb060 ("iio: adc: add support for Berlin")
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Link: https://lore.kernel.org/r/20221129020316.191731-1-wangxiongfeng2@huawei.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>