bridge_set_maxage
if (bridge_set_maxage(bif, val->v.integer) < 0)
bridge_set_maxage(bif, ctx->scratch->int1);
if (bridge_set_maxage(bif, val->v.integer) < 0)
bridge_set_maxage(bif, ctx->scratch->int1);
int bridge_set_maxage(struct bridge_if *bif, int32_t max_age);