优化异常处理以及级联设备状态查询

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

@@ -221,7 +221,7 @@ public class ZLMRTPServerFactory {
             if (localPort == 0) {
                 return null;
             }
-        }alarm
+        }
         SendRtpItem sendRtpItem = new SendRtpItem();
         sendRtpItem.setIp(ip);
         sendRtpItem.setPort(port);