usb: gadget: Refactor request completion

Use the recently introduced usb_gadget_giveback_request() in favor of
direct invocation of the completion routine.

All places in drivers/usb/ matching "[-.]complete(" were replaced with a
call to usb_gadget_giveback_request(). This was compile-tested with all
ARM drivers enabled and runtime-tested for musb.

Signed-off-by: Michal Sojka <sojka@merica.cz>
Acked-by: Felipe Balbi <balbi@ti.com>
Tested-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index 94f7a3f..7b5856f 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -1004,8 +1004,8 @@
 					hs_req = ep->req;
 					ep->req = NULL;
 					list_del_init(&hs_req->queue);
-					hs_req->req.complete(&ep->ep,
-							     &hs_req->req);
+					usb_gadget_giveback_request(&ep->ep,
+								    &hs_req->req);
 				}
 
 				/* If we have pending request, then start it */
@@ -1262,7 +1262,7 @@
 
 	if (hs_req->req.complete) {
 		spin_unlock(&hsotg->lock);
-		hs_req->req.complete(&hs_ep->ep, &hs_req->req);
+		usb_gadget_giveback_request(&hs_ep->ep, &hs_req->req);
 		spin_lock(&hsotg->lock);
 	}