drm: qxl: Embed drm_device into driver structure

This is the recommended way to create the drm_device structure,
according to DRM documentation.

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170127010548.27970-4-krisman@collabora.co.uk
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

drivers/gpu/drm/qxl/qxl_ioctl.c

@@ -64,7 +64,7 @@ static int qxl_map_ioctl(struct drm_device *dev, void *data,
 	struct qxl_device *qdev = dev->dev_private;
 	struct drm_qxl_map *qxl_map = data;
 
-	return qxl_mode_dumb_mmap(file_priv, qdev->ddev, qxl_map->handle,
+	return qxl_mode_dumb_mmap(file_priv, &qdev->ddev, qxl_map->handle,
 				  &qxl_map->offset);
 }