Fix failure

bin/stream_util.dart

Index: bin/stream_util.dart
===================================================================
--- bin/stream_util.dart	(revision 3211)
+++ bin/stream_util.dart	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
@@ -8,7 +8,7 @@
   List<int> read([int len]) {
     if (_closeCallbackCalled) return null;
     int bytesToRead = available();
-    if (bytesToRead == 0) {
+    if (bytesToRead <= 0) {
       _checkScheduleCallbacks();
       return null;
     }