and also make sure we do not destroy it if it does not exist Fixes: #274
I6Z6KWIEXPI5JVIVQCMLXRZJT3ZQ22SHOMT2UPGEWTXXFJ7GNJ7QC
c->fullscreen_bg = wlr_scene_rect_create(c->scene,
c->geom.width, c->geom.height, fullscreen_bg);
wlr_scene_node_lower_to_bottom(&c->fullscreen_bg->node);
if (!c->fullscreen_bg) {
c->fullscreen_bg = wlr_scene_rect_create(c->scene,
c->geom.width, c->geom.height, fullscreen_bg);
wlr_scene_node_lower_to_bottom(&c->fullscreen_bg->node);
}