Merge pull request #776 from microsoft/dev/lifengl/fixTypo

Fix a typo in the JTF dependency computation code.

Author: lifengl

src/Microsoft.VisualStudio.Threading/JoinableTaskDependencyGraph.cs

@@ -760,7 +760,7 @@ private static void ComputeSelfAndDescendentOrJoinedJobsAndRemainTasks(IJoinable
                 {
                     if (reachableNodes.Add(taskOrCollection))
                     {
-                        if (remainNodes.Remove(taskOrCollection) && reachableNodes.Count == 0)
+                        if (remainNodes.Remove(taskOrCollection) && remainNodes.Count == 0)
                         {
                             // no remain task left, quit the loop earlier
                             return;
@@ -772,6 +772,10 @@ private static void ComputeSelfAndDescendentOrJoinedJobsAndRemainTasks(IJoinable
                             foreach (KeyValuePair<IJoinableTaskDependent, int> item in dependencies)
                             {
                                 ComputeSelfAndDescendentOrJoinedJobsAndRemainTasks(item.Key, reachableNodes, remainNodes);
+                                if (remainNodes.Count == 0)
+                                {
+                                    return;
+                                }
                             }
                         }
                     }