Revert "leds: flash: mt6360: Fix device_for_each_child_node() refcounting in error paths"

This reverts commit 28a01c6b which is
commit 73b03b27 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I69e0e9a4c495afd1fb38ba691c5616e49b7fcf63
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>