code style

store/src/main/java/org/apache/rocketmq/store/CommitLog.java

@@ -23,7 +23,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
-
 import org.apache.rocketmq.common.ServiceThread;
 import org.apache.rocketmq.common.UtilAll;
 import org.apache.rocketmq.common.constant.LoggerName;

store/src/main/java/org/apache/rocketmq/store/DefaultMessageStore.java

@@ -35,7 +35,6 @@ import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicLong;
-
 import org.apache.rocketmq.common.BrokerConfig;
 import org.apache.rocketmq.common.MixAll;
 import org.apache.rocketmq.common.ServiceThread;