The device node reference obtained with of_get_child_by_name() should be
dropped on error paths.

Fixes: 26aec009 ("regulator: add device tree support for s5m8767")
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20210121155914.48034-1-krzk@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>