The fwnode_for_each_child_node() loop requires manual intervention to
decrement the child refcount in case of an early return.

Add the missing calls to fwnode_handle_put(child) to avoid memory leaks
in the error paths.

Cc: stable@vger.kernel.org
Fixes: 679f8652 ("leds: Add mt6360 driver")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Link: https://lore.kernel.org/r/20240611-leds-mt6360-memleak-v1-1-93642eb5011e@gmail.comSigned-off-by: Lee Jones <lee@kernel.org>