initialize WFObj::Buffer parameters

WFObj.h

@@ -19,7 +19,7 @@ public:
     class Buffer
     {
         public:
-            Buffer() : m_alloc(false) {}
+            Buffer() : m_alloc(false) {data = NULL; length = 0;}
             ~Buffer() { if (m_alloc) delete data; }
             uint8_t *data;
             size_t length;