修复 流已经关闭后，再次调用关闭流的接口，返回超时

panlinlin

2021-04-16 c5f2aba9b20089f184ce175b58a33a881ea9e0b1

 src/main/java/com/genersoft/iot/vmp/media/zlm/ZLMHttpHookSubscribe.java

@@ -97,7 +97,7 @@
     * @return
     */
    public List<ZLMHttpHookSubscribe.Event> getSubscribes(HookType type) {
        ZLMHttpHookSubscribe.Event event= null;
        // ZLMHttpHookSubscribe.Event event= null;
        Map<JSONObject, Event> eventMap = allSubscribes.get(type);
        if (eventMap == null) {
            return null;