merged superfluous if with while loop

core/src/main/java/hudson/model/AbstractItem.java

@@ -730,7 +730,6 @@ public abstract class AbstractItem extends Actionable implements Item, HttpDelet
                                 
                         if (subtask != null) {        
                             Item item = Tasks.getItemOf(subtask);
-                            if (item != null) {
                             while (item != null) {
                                 if (item == this) {
                                     buildsInProgress.put(e, e.getCurrentExecutable());
@@ -746,7 +745,6 @@ public abstract class AbstractItem extends Actionable implements Item, HttpDelet
                         }
                     }
                 }
-                }
                 if (!buildsInProgress.isEmpty()) {
                     // give them 15 seconds or so to respond to the interrupt
                     long expiration = System.nanoTime() + TimeUnit.SECONDS.toNanos(15);