Input: adc-joystick - use device_for_each_child_node_scoped()

Switch to the _scoped() version introduced in commit 365130fd
("device property: Introduce device_for_each_child_node_scoped()")
to remove the need for manual calling of fwnode_handle_put() in the
paths where the code exits the loop early.

In this case the err_fwnode_put label was no longer necessary and the
error code is returned directly.

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://lore.kernel.org/r/20240412-input_device_for_each_child_node_scoped-v1-6-dbad1bc7ea84@gmail.com


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>