HDFS-16364. Remove unnecessary brackets in NameNodeRpcServer#L453 (#3742)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeRpcServer.java

@@ -450,7 +450,7 @@ public class NameNodeRpcServer implements NamenodeProtocols {
 
     GlobalStateIdContext stateIdContext = null;
     if (enableStateContext) {
-      stateIdContext = new GlobalStateIdContext((namesystem));
+      stateIdContext = new GlobalStateIdContext(namesystem);
     }
 
     clientRpcServer = new RPC.Builder(conf)