usb: dwc3: Update dwc3 udc to use usb_endpoint_descriptor inside the struct usb_ep

Remove redundant pointer to struct usb_endpoint_descriptor.

Signed-off-by: Ido Shayevitz <idos@codeaurora.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index 3584a16..3453ca1 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -179,7 +179,7 @@
 	int				ret;
 
 	spin_lock_irqsave(&dwc->lock, flags);
-	if (!dep->desc) {
+	if (!dep->endpoint.desc) {
 		dev_dbg(dwc->dev, "trying to queue request %p to disabled %s\n",
 				request, dep->name);
 		ret = -ESHUTDOWN;