etnaviv: fill missing offset in etna_resource_get_handle

Without this gbm_bo_get_offset() can return 0 where it shouldn't.

Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Cc: <mesa-stable@lists.freedesktop.org>

src/gallium/drivers/etnaviv/etnaviv_resource.c

@@ -622,6 +622,7 @@ etna_resource_get_handle(struct pipe_screen *pscreen,
       rsc = etna_resource(rsc->external);
 
    handle->stride = rsc->levels[0].stride;
+   handle->offset = rsc->levels[0].offset;
    handle->modifier = layout_to_modifier(rsc->layout);
 
    if (handle->type == WINSYS_HANDLE_TYPE_SHARED) {