Seg Fault sometimes when OPL3_Reset is called

[fawtytoo]

I've written my own midi player called Midiplay and am currently using Nuked for synthesizing the output.
Each time I change midi tracks, I call OPL3_Reset, but it can (but not always) cause a Seg Fault.
The solution was to call OPL3_Reset only once during Midiplay's initialisation. Then, during track initialisation:

    opl3_chip   oplChip;
    int i;

    for (i = 0; i < 18; i++)
    {
        oplChip.channel[i].cha = 0;
        oplChip.channel[i].chb = 0;
    }

    oplChip.writebuf_samplecnt = 0;
    oplChip.writebuf_cur = 0;
    oplChip.writebuf_last = 0;
    oplChip.writebuf_lasttime = 0;
    for (i = 0; i < OPL_WRITEBUF_SIZE; i++)
    {
        oplChip.writebuf[i].reg = 0;
    }

Perhaps it would be advantageous to have an OPL3_Init function. Then OPL3_Reset could just do the minimal stuff.
Notice that I've initialised left & right channels to zero to silence them.

[fawtytoo]

The segfault was due to Midiplay resetting the track information before resetting the channels first. SDL callbacks are tricky things.