wined3d: Use WINED3D_LOCATION_DISCARDED before initializing buffers with data.

dlls/wined3d/buffer.c

@@ -1354,7 +1354,7 @@ static HRESULT buffer_init(struct wined3d_buffer *buffer, struct wined3d_device
     }
     buffer->buffer_type_hint = buffer_type_hint_from_bind_flags(gl_info, bind_flags);
     buffer->bind_flags = bind_flags;
-    buffer->locations = WINED3D_LOCATION_SYSMEM;
+    buffer->locations = data ? WINED3D_LOCATION_DISCARDED : WINED3D_LOCATION_SYSMEM;
 
     if (!wined3d_resource_allocate_sysmem(&buffer->resource))
         return E_OUTOFMEMORY;