ATH_TXMAXTRY
if (try0 != ATH_TXMAXTRY)
try0 = ATH_TXMAXTRY;
amn->amn_tx_try0 = ATH_TXMAXTRY;
on->on_tx_try0 = ATH_TXMAXTRY; /* max tries at rate 0 */
*try0 = ATH_TXMAXTRY;
*try0 = mrr ? 2 : ATH_TXMAXTRY;