usb: gadget: dummy_hcd: don't assign ->desc on error case

If the stream check fails then we leave ep->desc assigend but we return
with an error code. The caller assumes the endpoint is not enabled
(which is the case) but it can not enable it again due to this
assigment.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

drivers/usb/gadget/dummy_hcd.c

@@ -514,7 +514,6 @@ static int dummy_enable(struct usb_ep *_ep,
 	}
 
 	_ep->maxpacket = max;
-	ep->desc = desc;
 	if (usb_ss_max_streams(_ep->comp_desc)) {
 		if (!usb_endpoint_xfer_bulk(desc)) {
 			dev_err(udc_dev(dum), "Can't enable stream support on "
@@ -523,6 +522,7 @@ static int dummy_enable(struct usb_ep *_ep,
 		}
 		ep->stream_en = 1;
 	}
+	ep->desc = desc;
 
 	dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n",
 		_ep->name,