usb: dwc2: Remove unnecessary request length checking

Remove request length checking from dwc2_hsotg_unmap_dma() and
dwc2_hsotg_map_dma(). That checking is done in functions called from
those functions, usb_gadget_unmap_request_by_dev() and
usb_gadget_map_request_by_dev() respectively, so it's unnecessary.
Signed-off-by: Razmik Karapetyan <razmik@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc2/gadget.c

@@ -316,11 +316,6 @@ static void dwc2_hsotg_unmap_dma(struct dwc2_hsotg *hsotg,
 				struct dwc2_hsotg_req *hs_req)
 {
 	struct usb_request *req = &hs_req->req;
-
-	/* ignore this if we're not moving any data */
-	if (hs_req->req.length == 0)
-		return;
-
 	usb_gadget_unmap_request(&hsotg->gadget, req, hs_ep->dir_in);
 }
 
@@ -1101,13 +1096,8 @@ static int dwc2_hsotg_map_dma(struct dwc2_hsotg *hsotg,
 			     struct dwc2_hsotg_ep *hs_ep,
 			     struct usb_request *req)
 {
-	struct dwc2_hsotg_req *hs_req = our_req(req);
 	int ret;
 
-	/* if the length is zero, ignore the DMA data */
-	if (hs_req->req.length == 0)
-		return 0;
-
 	ret = usb_gadget_map_request(&hsotg->gadget, req, hs_ep->dir_in);
 	if (ret)
 		goto dma_error;