[ISSUE alibaba#1576] Delete redundant if statment in select MessageQueue (alibaba#1607)

* delete redundant if statment

* Correct code style

Author: ShadowySpirits

client/src/main/java/org/apache/rocketmq/client/latency/MQFaultStrategy.java

@@ -64,10 +64,8 @@ public MessageQueue selectOneMessageQueue(final TopicPublishInfo tpInfo, final S
                     if (pos < 0)
                         pos = 0;
                     MessageQueue mq = tpInfo.getMessageQueueList().get(pos);
-                    if (latencyFaultTolerance.isAvailable(mq.getBrokerName())) {
-                        if (null == lastBrokerName || mq.getBrokerName().equals(lastBrokerName))
-                            return mq;
-                    }
+                    if (latencyFaultTolerance.isAvailable(mq.getBrokerName()))
+                        return mq;
                 }
 
                 final String notBestBroker = latencyFaultTolerance.pickOneAtLeast();