drm/virtio: Remove incorrect kfree()

The virtio_gpu_output is a member of struct virtio_gpu_device
and is not a dynamically-allocated chunk, so it's wrong to kfree() it.
Removing it fixes a memory corruption BUG() that can be triggered
when the virtio-gpu driver is removed.
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20190102175507.4653-1-ezequiel@collabora.com

drivers/gpu/drm/virtio/virtgpu_display.c

@@ -243,12 +243,8 @@ static enum drm_connector_status virtio_gpu_conn_detect(
 
 static void virtio_gpu_conn_destroy(struct drm_connector *connector)
 {
-	struct virtio_gpu_output *virtio_gpu_output =
-		drm_connector_to_virtio_gpu_output(connector);
-
 	drm_connector_unregister(connector);
 	drm_connector_cleanup(connector);
-	kfree(virtio_gpu_output);
 }
 
 static const struct drm_connector_funcs virtio_gpu_connector_funcs = {