fix checkstyle issue
diff --git a/hadoop-hdds/framework/src/main/java/org/apache/hadoop/hdds/server/OzoneProtocolMessageDispatcher.java b/hadoop-hdds/framework/src/main/java/org/apache/hadoop/hdds/server/OzoneProtocolMessageDispatcher.java
index 85b8d3b..d67a759 100644
--- a/hadoop-hdds/framework/src/main/java/org/apache/hadoop/hdds/server/OzoneProtocolMessageDispatcher.java
+++ b/hadoop-hdds/framework/src/main/java/org/apache/hadoop/hdds/server/OzoneProtocolMessageDispatcher.java
@@ -22,7 +22,6 @@
 import org.apache.hadoop.ozone.protocolPB.ProtocolMessageMetrics;
 
 import com.google.protobuf.ProtocolMessageEnum;
-import com.google.protobuf.RpcController;
 import com.google.protobuf.ServiceException;
 import io.opentracing.Scope;
 import org.slf4j.Logger;