usb: gadget: net2280: don't assign gadget.dev.release directly

udc-core provides a better way to handle release
methods, let's use it.

Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/gadget/net2280.c b/drivers/usb/gadget/net2280.c
index 9e4f0a2..e5f2ef1 100644
--- a/drivers/usb/gadget/net2280.c
+++ b/drivers/usb/gadget/net2280.c
@@ -2707,7 +2707,6 @@
 	dev->gadget.max_speed = USB_SPEED_HIGH;
 
 	/* the "gadget" abstracts/virtualizes the controller */
-	dev->gadget.dev.release = gadget_release;
 	dev->gadget.name = driver_name;
 
 	/* now all the pci goodies ... */
@@ -2819,7 +2818,8 @@
 	retval = device_create_file (&pdev->dev, &dev_attr_registers);
 	if (retval) goto done;
 
-	retval = usb_add_gadget_udc(&pdev->dev, &dev->gadget);
+	retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,
+			gadget_release);
 	if (retval)
 		goto done;
 	return 0;