usb: dwc3: ep0: drop unnecessary variable

When returning from ep0_queue, we have an
unnecessary ret variable which is always
zero. Remove it.

Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index 9b94886..962fb9b 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -125,7 +125,6 @@
 		struct dwc3_request *req)
 {
 	struct dwc3		*dwc = dep->dwc;
-	int			ret = 0;
 
 	req->request.actual	= 0;
 	req->request.status	= -EINPROGRESS;
@@ -165,7 +164,7 @@
 			dev_dbg(dwc->dev, "too early for delayed status\n");
 	}
 
-	return ret;
+	return 0;
 }
 
 int dwc3_gadget_ep0_queue(struct usb_ep *ep, struct usb_request *request,