WM_F_CRC_STRIP
if ((sc->sc_flags & WM_F_CRC_STRIP) == 0) {
sc->sc_flags |= WM_F_CRC_STRIP;
sc->sc_flags &= ~WM_F_CRC_STRIP;
sc->sc_flags |= WM_F_CRC_STRIP;
if ((sc->sc_flags & WM_F_CRC_STRIP) != 0)