Fix order initialization warning

Change-Id: I77ddf1dbec2d11c273163efae6526d3deca92dbf

vdi/hip_internal.hpp

@@ -87,6 +87,8 @@ namespace hip {
     /// Device's ID
     /// Store it here so we don't have to loop through the device list every time
     int deviceId_;
+    /// VDI host queue for default streams
+    Stream null_stream_;
     //Maintain list of user enabled peers
     std::list<int> userEnabledPeers;
   public: