usb: gadget: pch_udc: don't free devm allocated memory

Coccinelle caught this instance of us kfree()ing
devm-allocated memory. The solution is just to not
do anything in our gadget_release.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/gadget/udc/pch_udc.c

@@ -2834,17 +2834,6 @@ static void pch_udc_setup_ep0(struct pch_udc_dev *dev)
 				       UDC_DEVINT_SI | UDC_DEVINT_SC);
 }
 
-/**
- * gadget_release() - Free the gadget driver private data
- * @pdev	reference to struct pci_dev
- */
-static void gadget_release(struct device *pdev)
-{
-	struct pch_udc_dev *dev = dev_get_drvdata(pdev);
-
-	kfree(dev);
-}
-
 /**
  * pch_udc_pcd_reinit() - This API initializes the endpoint structures
  * @dev:	Reference to the driver structure
@@ -3151,8 +3140,7 @@ static int pch_udc_probe(struct pci_dev *pdev,
 
 	/* Put the device in disconnected state till a driver is bound */
 	pch_udc_set_disconnect(dev);
-	retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,
-			gadget_release);
+	retval = usb_add_gadget_udc(&pdev->dev, &dev->gadget);
 	if (retval)
 		goto finished;
 	return 0;