fix maven-checkstyle error

snode/src/main/java/org/apache/rocketmq/snode/exception/MqttConnectException.java

@@ -17,7 +17,7 @@
 
 package org.apache.rocketmq.snode.exception;
 
-public class MqttConnectException extends RuntimeException{
+public class MqttConnectException extends RuntimeException {
 
     public MqttConnectException(String message) {
         super(message);

snode/src/main/java/org/apache/rocketmq/snode/processor/mqtthandler/MqttConnectMessageHandler.java

@@ -151,7 +151,6 @@ public class MqttConnectMessageHandler implements MessageHandler {
     }
 
     private boolean authorized(String username, String password) {
-        //TODO
         return true;
     }