usb: mtu3: simplify mtu3_req_complete()

Use argument req directly instead of mreq->request, they
are the same usb request.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/1595834101-13094-11-git-send-email-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Chunfeng Yun

drivers/usb/mtu3/mtu3_gadget.c

@@ -15,27 +15,24 @@ void mtu3_req_complete(struct mtu3_ep *mep,
 __releases(mep->mtu->lock)
 __acquires(mep->mtu->lock)
 {
-	struct mtu3_request *mreq;
-	struct mtu3 *mtu;
+	struct mtu3_request *mreq = to_mtu3_request(req);
+	struct mtu3 *mtu = mreq->mtu;
 
-	mreq = to_mtu3_request(req);
 	list_del(&mreq->list);
-	if (mreq->request.status == -EINPROGRESS)
-		mreq->request.status = status;
+	if (req->status == -EINPROGRESS)
+		req->status = status;
 
-	mtu = mreq->mtu;
 	trace_mtu3_req_complete(mreq);
 	spin_unlock(&mtu->lock);
 
 	/* ep0 makes use of PIO, needn't unmap it */
 	if (mep->epnum)
 		usb_gadget_unmap_request(&mtu->g, req, mep->is_in);
 
-	dev_dbg(mtu->dev, "%s complete req: %p, sts %d, %d/%d\n", mep->name,
-		req, req->status, mreq->request.actual, mreq->request.length);
-
-	usb_gadget_giveback_request(&mep->ep, &mreq->request);
+	dev_dbg(mtu->dev, "%s complete req: %p, sts %d, %d/%d\n",
+		mep->name, req, req->status, req->actual, req->length);
 
+	usb_gadget_giveback_request(&mep->ep, req);
 	spin_lock(&mtu->lock);
 }