YARN-11226. Fix CheckStyle.

Author: slfan1989

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/test/java/org/apache/hadoop/yarn/server/router/webapp/MockDefaultRequestInterceptorREST.java

@@ -1065,7 +1065,7 @@ public void setMockRM(MockRM mockRM) {
   public RMQueueAclInfo checkUserAccessToQueue(String queue, String username,
       String queueAclType, HttpServletRequest hsr) throws AuthorizationException {
 
-    ResourceManager mockRM2 = mock(ResourceManager.class);
+    ResourceManager mockRm = mock(ResourceManager.class);
     Configuration conf = new YarnConfiguration();
 
     ResourceScheduler mockScheduler = new CapacityScheduler() {
@@ -1085,8 +1085,8 @@ public synchronized boolean checkAccess(UserGroupInformation callerUGI,
       }
     };
 
-    when(mockRM2.getResourceScheduler()).thenReturn(mockScheduler);
-    MockRMWebServices webSvc = new MockRMWebServices(mockRM2, conf, mock(HttpServletResponse.class));
+    when(mockRm.getResourceScheduler()).thenReturn(mockScheduler);
+    MockRMWebServices webSvc = new MockRMWebServices(mockRm, conf, mock(HttpServletResponse.class));
     return webSvc.checkUserAccessToQueue(queue, username, queueAclType, hsr);
   }