Fixed build error introduced by test upgrade without code upgrade.

Change-Id: If0dc93c9013ccd1898fb1ec7eb34b355772d6b82
diff --git a/aos/common/condition.h b/aos/common/condition.h
index c913b47..ef51b89 100644
--- a/aos/common/condition.h
+++ b/aos/common/condition.h
@@ -54,7 +54,8 @@
   // and will be locked when this method returns.
   // NOTE: The relocking of the mutex is not performed atomically with waking
   // up.
-  void Wait();
+  // Returns false.
+  bool Wait();
 
   // Signals at most 1 other process currently Wait()ing on this condition
   // variable. Calling this does not require the mutex associated with this