mha_dataout
n = mha_dataout(sc, sc->sc_dp, sc->sc_dleft);
n = mha_dataout(sc, sc->sc_dp, sc->sc_dleft);
n = mha_dataout(sc, sc->sc_dp, sc->sc_dleft);
int mha_dataout(struct mha_softc *, u_char *, int);