wsdisplay_getactivescreen
sc->sc_screen_resumed = wsdisplay_getactivescreen(wsc);
*(int*)data = wsdisplay_getactivescreen(sc);
idx = wsdisplay_getactivescreen(sc);
idx = wsdisplay_getactivescreen(sc);
int wsdisplay_getactivescreen(struct wsdisplay_softc *);