usb: gadget: omap_udc: kfree(NULL) is safe

we don't need to check for _req because
kfree(NULL) is safe. Also, if someone
actually passes a NULL pointer to be freed
by usb_ep_free_request(), he deserves any
issue he faces.
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/omap_udc.c

@@ -282,8 +282,7 @@ omap_free_request(struct usb_ep *ep, struct usb_request *_req)
 {
 	struct omap_req	*req = container_of(_req, struct omap_req, req);
 
-	if (_req)
-		kfree(req);
+	kfree(req);
 }
 
 /*-------------------------------------------------------------------------*/