Clean vendor dependencies

vendor/github.com/eclipse/paho.mqtt.golang/oops.go

@@ -1,21 +0,0 @@
-/*
- * Copyright (c) 2013 IBM Corp.
- *
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
- *
- * Contributors:
- *    Seth Hoenig
- *    Allan Stockdill-Mander
- *    Mike Robertson
- */
-
-package mqtt
-
-func chkerr(e error) {
-	if e != nil {
-		panic(e)
-	}
-}