usb: gadget: udc: atmel: fix uninitialized read in debug printk

Fixed commit moved the assignment of 'req', but did not update a
reference in the DBG() call. Use the argument as it was renamed.

Fixes: 5fb694f ("usb: gadget: udc: atmel: fix possible oops when unloading module")
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

drivers/usb/gadget/udc/atmel_usba_udc.c

@@ -865,7 +865,7 @@ static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 	u32 status;
 
 	DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
-			ep->ep.name, req);
+			ep->ep.name, _req);
 
 	spin_lock_irqsave(&udc->lock, flags);