regulator: max20086: fix error code in max20086_parse_regulators_dt()

This code accidentally returns PTR_ERR(NULL) which is success.  It
should return a negative error code.

Fixes: bfff546a ("regulator: Add MAX20086-MAX20089 driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20220111072657.GK11243@kiliSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/max20086-regulator.c

@@ -140,7 +140,7 @@ static int max20086_parse_regulators_dt(struct max20086 *chip, bool *boot_on)
 	node = of_get_child_by_name(chip->dev->of_node, "regulators");
 	if (!node) {
 		dev_err(chip->dev, "regulators node not found\n");
-		return PTR_ERR(node);
+		return -ENODEV;
 	}
 
 	for (i = 0; i < chip->info->num_outputs; ++i)