-- more assert fixes for thrift concurrency

Reviewed By: mcslee


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665074 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/cpp/src/concurrency/Mutex.cpp b/lib/cpp/src/concurrency/Mutex.cpp
index 0f650a1..5993ea1 100644
--- a/lib/cpp/src/concurrency/Mutex.cpp
+++ b/lib/cpp/src/concurrency/Mutex.cpp
@@ -21,7 +21,7 @@
  public:
   impl() : initialized_(false) {
     int ret = pthread_mutex_init(&pthread_mutex_, NULL);
-    assert(ret);
+    assert(ret == 0);
     initialized_ = true;
   }
 
@@ -29,7 +29,7 @@
     if (initialized_) {
       initialized_ = false;
       int ret = pthread_mutex_destroy(&pthread_mutex_);
-      assert(ret);
+      assert(ret == 0);
     }
   }