usb: dwc3: imx8mp: fix device leak at unbind

Make sure to drop the reference to the dwc3 device taken by
of_find_device_by_node() on probe errors and on driver unbind.

Fixes: 6dd2565 ("usb: dwc3: add imx8mp dwc3 glue layer driver")
Cc: stable@vger.kernel.org	# 5.12
Cc: Li Jun <jun.li@nxp.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20250724091910.21092-2-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: jhovold

drivers/usb/dwc3/dwc3-imx8mp.c

@@ -244,14 +244,16 @@ static int dwc3_imx8mp_probe(struct platform_device *pdev)
 					IRQF_ONESHOT, dev_name(dev), dwc3_imx);
 	if (err) {
 		dev_err(dev, "failed to request IRQ #%d --> %d\n", irq, err);
-		goto depopulate;
+		goto put_dwc3;
 	}
 
 	device_set_wakeup_capable(dev, true);
 	pm_runtime_put(dev);
 
 	return 0;
 
+put_dwc3:
+	put_device(&dwc3_imx->dwc3->dev);
 depopulate:
 	of_platform_depopulate(dev);
 remove_swnode:
@@ -265,8 +267,11 @@ static int dwc3_imx8mp_probe(struct platform_device *pdev)
 
 static void dwc3_imx8mp_remove(struct platform_device *pdev)
 {
+	struct dwc3_imx8mp *dwc3_imx = platform_get_drvdata(pdev);
 	struct device *dev = &pdev->dev;
 
+	put_device(&dwc3_imx->dwc3->dev);
+
 	pm_runtime_get_sync(dev);
 	of_platform_depopulate(dev);
 	device_remove_software_node(dev);