regulator: bq257xx: fix OF node reference imbalance

The driver reuses the OF node of the parent multi-function device but
fails to take another reference to balance the one dropped by the
platform bus code when unbinding the MFD and deregistering the child
devices.

Fix this by using the intended helper for reusing OF nodes.

Fixes: 981dd16 ("regulator: bq257xx: Add bq257xx boost regulator driver")
Cc: stable@vger.kernel.org	# 6.18
Cc: Chris Morgan <macromorgan@hotmail.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://patch.msgid.link/20260408073055.5183-2-johan@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: jhovold

drivers/regulator/bq257xx-regulator.c

@@ -142,8 +142,7 @@ static int bq257xx_regulator_probe(struct platform_device *pdev)
 	struct device_node *np = dev->of_node;
 	struct regulator_config cfg = {};
 
-	pdev->dev.of_node = pdev->dev.parent->of_node;
-	pdev->dev.of_node_reused = true;
+	device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);
 
 	pdata = devm_kzalloc(&pdev->dev, sizeof(struct bq257xx_reg_data), GFP_KERNEL);
 	if (!pdata)