AROS IDE fix proposal (minimal changes)

void ata_WaitNano(ULONG ns, struct ataBase *base)
{
    ns /= 2;
    if (!(SysBase->AttnFlags & AFF_68020))
        ns /= 2;
    while (ns >= 65536 * 4) {
        busywait(65535);
        ns -= 65536 * 4;
    }

    busywait(ns / 4);
}