remove extra spaces

Author: Thomas Graves

core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala

@@ -1144,10 +1144,10 @@ class DAGScheduler(
         null
       }
 
-    // The stage may have already finished when we get this event -- eg. maybe it was a 
-    // speculative task. It is important that we send the TaskEnd event in any case, so listeners 
+    // The stage may have already finished when we get this event -- eg. maybe it was a
+    // speculative task. It is important that we send the TaskEnd event in any case, so listeners
     // are properly notified and can chose to handle it. For instance, some listeners are
-    // doing their own accounting and if they don't get the task end event they think 
+    // doing their own accounting and if they don't get the task end event they think
     // tasks are still running when they really aren't.
     listenerBus.post(SparkListenerTaskEnd(
        stageId, task.stageAttemptId, taskType, event.reason, event.taskInfo, taskMetrics))