YARN-10574. Fix the FindBugs warning introduced in YARN-10506. Contributed by Gergely Pollak

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/CapacityScheduler.java

@@ -3387,8 +3387,7 @@ public class CapacityScheduler extends
                 + "which does not exist " + parentQueueName);
       }
 
-      if (parentQueue != null &&
-          conf.isAutoCreateChildQueueEnabled(parentQueue.getQueuePath())) {
+      if (conf.isAutoCreateChildQueueEnabled(parentQueue.getQueuePath())) {
         // Case 1: Handle ManagedParentQueue
         AutoCreatedLeafQueue autoCreatedLeafQueue = null;
         ManagedParentQueue autoCreateEnabledParentQueue =