g_union_destroy
g_union_destroy(NULL, cp->geom, true);
return (g_union_destroy(NULL, gp, false));
g_union_destroy(NULL, gp, true);
error = g_union_destroy(verbose ? req : NULL, gp, *force);
static int g_union_destroy(struct gctl_req *req, struct g_geom *gp, bool force);