wined3d: Support more than one back buffer.
diff --git a/dlls/wined3d/wined3d_private.h b/dlls/wined3d/wined3d_private.h
index 10d21d8..cd7cfa0 100644
--- a/dlls/wined3d/wined3d_private.h
+++ b/dlls/wined3d/wined3d_private.h
@@ -1125,7 +1125,7 @@
     IWineD3DDeviceImpl       *wineD3DDevice;
 
     /* IWineD3DSwapChain fields */
-    IWineD3DSurface          *backBuffer;
+    IWineD3DSurface         **backBuffer;
     IWineD3DSurface          *frontBuffer;
     BOOL                      wantsDepthStencilBuffer;
     D3DPRESENT_PARAMETERS     presentParms;