fix compile error

Author: K0K0V0K

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServicesNodes.java

@@ -965,7 +965,7 @@ public void testNodesAllocationTags() throws Exception {
         .path("nodes").request("application/json").get(Response.class);
     assertEquals(MediaType.APPLICATION_JSON + ";" + JettyUtils.UTF_8,
         response.getMediaType().toString());
-    JSONObject nodesInfojson = response.readEntity(JSONObject.class);
+    JSONObject nodesInfoJson = response.readEntity(JSONObject.class);
     verifyNodeAllocationTag(nodesInfoJson, expectedAllocationTags);
 
     rm.stop();