regulator: max20086: Fix refcount leak in max20086_parse_regulators_dt()

There is a missing call to of_node_put() if devm_kcalloc() fails.
Fix this by changing the code to use cleanup.h magic to drop the
refcount.

Fixes: 6b0cd727 ("regulator: max20086: fix invalid memory access")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://patch.msgid.link/aDVRLqgJWMxYU03G@stanley.mountain


Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mark Brown <broonie@kernel.org>