static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req)
{
	struct ffs_data *ffs = req->context;

	complete_all(&ffs->ep0req_completion);
}
static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req)
{
	struct ffs_data *ffs = req->context;

	complete_all(&ffs->ep0req_completion);
}