backend-drm: Correctly tear down the DRM backend

It seem that we skipped to put back in TEXT mode the tty, in case a DRM
device node wasn't present at that time, or it isn't present at all. This
orders the destroy part correctly as to handle that case as well.

As a side effect, as the tty will still be set to GRAPHICS mode we will
require a manual change of the tty number, which might be not possible
on all systems. Properly putting back the tty to TEXT mode should avoid
that, and allows to re-use the same tty no in case the DRM device has
been created at a later point in time.

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>

libweston/backend-drm/drm.c

@@ -3031,10 +3031,10 @@ err_sprite:
 	destroy_sprites(b);
 err_udev_dev:
 	udev_device_unref(drm_device);
-err_launcher:
-	weston_launcher_destroy(compositor->launcher);
 err_udev:
 	udev_unref(b->udev);
+err_launcher:
+	weston_launcher_destroy(compositor->launcher);
 err_compositor:
 	weston_compositor_shutdown(compositor);
 	free(b);