usb: musb: gadget: check the correct list_head

We are now using our own list_head, so we should
be checking against that, not the gadget driver's
list_head.

Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/musb/musb_gadget.c

@@ -1296,7 +1296,7 @@ static int musb_gadget_dequeue(struct usb_ep *ep, struct usb_request *request)
 	}
 
 	/* if the hardware doesn't have the request, easy ... */
-	if (musb_ep->req_list.next != &request->list || musb_ep->busy)
+	if (musb_ep->req_list.next != &req->list || musb_ep->busy)
 		musb_g_giveback(musb_ep, request, -ECONNRESET);
 
 	/* ... else abort the dma transfer ... */