fix checkstyle.

Author: hfutatzhanghb

hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/async/TestRouterAsyncRpcWhenNamenodeFailover.java

@@ -67,7 +67,7 @@ public void testGetFileInfoWhenNsFailover() throws Exception {
     transitionClusterNSToActive(cluster, 0);
 
     String basePath = "/ARR/testGetFileInfo";
-      routerClient.mkdirs(basePath);
+    routerClient.mkdirs(basePath);
     DirectoryListing directoryListing = routerClient.listPaths("/ARR", new byte[0]);
     assertEquals(1, directoryListing.getPartialListing().length);