static void
 send_arcofi(struct IsdnCardState *cs) {
-       u_char val;
-       
        add_arcofi_timer(cs);
        cs->dc.isac.mon_txp = 0;
        cs->dc.isac.mon_txc = cs->dc.isac.arcofi_list->len;
        cs->dc.isac.mocr &= 0x0f;
        cs->dc.isac.mocr |= 0xa0;
        cs->writeisac(cs, ISAC_MOCR, cs->dc.isac.mocr);
-       val = cs->readisac(cs, ISAC_MOSR);
+       (void) cs->readisac(cs, ISAC_MOSR);
        cs->writeisac(cs, ISAC_MOX1, cs->dc.isac.mon_tx[cs->dc.isac.mon_txp++]);
        cs->dc.isac.mocr |= 0x10;
        cs->writeisac(cs, ISAC_MOCR, cs->dc.isac.mocr);