drm: savage: dev->agp_buffer_map is not initialized for AGP DMA on savages

fd.o bug 8662
Signed-off-by: NDave Airlie <airlied@linux.ie>

drivers/char/drm/savage_bci.c

@@ -728,6 +728,7 @@ static int savage_do_init_bci(drm_device_t * dev, drm_savage_init_t * init)
 		dev_priv->status = NULL;
 	}
 	if (dev_priv->dma_type == SAVAGE_DMA_AGP && init->buffers_offset) {
+		dev->agp_buffer_token = init->buffers_offset;
 		dev->agp_buffer_map = drm_core_findmap(dev,
 						       init->buffers_offset);
 		if (!dev->agp_buffer_map) {