bstp_root_bridge
static int bstp_root_bridge(struct bridge_softc *sc);
if (bstp_root_bridge(sc))
if (bstp_root_bridge(sc)) {
root = bstp_root_bridge(sc);
if ((bstp_root_bridge(sc) == 0) && root) {
root = bstp_root_bridge(sc);
if ((bstp_root_bridge(sc)) && (root == 0)) {
root = bstp_root_bridge(sc);
if (bstp_root_bridge(sc) && (root == 0)) {
root = bstp_root_bridge(sc);
if (bstp_root_bridge(sc) && (root == 0)) {