usb: gadget: core: Fix use-after-free of usb_request

Driver is tracing usb_request after freeing it.
Fix it by changing the order.
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/gadget/udc/core.c

@@ -180,8 +180,8 @@ EXPORT_SYMBOL_GPL(usb_ep_alloc_request);
 void usb_ep_free_request(struct usb_ep *ep,
 				       struct usb_request *req)
 {
-	ep->ops->free_request(ep, req);
 	trace_usb_ep_free_request(ep, req, 0);
+	ep->ops->free_request(ep, req);
 }
 EXPORT_SYMBOL_GPL(usb_ep_free_request);