element_parse_override_map only supprt two override maps

static int element_parse_override_map(
        const char *filename,
        unsigned line,
        const char *section,
        const char *lvalue,
        const char *rvalue,
        void *data,
        void *userdata) {

    pa_alsa_path *p = userdata;
    pa_alsa_element *e;
    const char *state = NULL;
    unsigned i = 0;
    char *n;

    if (!(e = element_get(p, section, TRUE))) {
        pa_log("[%s:%u] Override map makes no sense in '%s'", filename, line, 
section);
        return -1;
    }

    while ((n = pa_split(rvalue, ",", &state))) {
        pa_channel_position_mask_t m;

        if (!*n)
            m = 0;
        else {
            if ((m = parse_mask(n)) == 0) {
                pa_log("[%s:%u] Override map '%s' invalid in '%s'", filename, 
line, n, section);
                pa_xfree(n);
                return -1;
            }
        }

        if (pa_streq(lvalue, "override-map.1"))
            e->masks[i++][0] = m;
        else
            e->masks[i++][1] = m;

        /* Later on we might add override-map.3 and so on here ... */

        pa_xfree(n);
    }

    e->override_map = TRUE;

    return 0;
}

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https://bugs.launchpad.net/bugs/936539

Title:
  [AV200 - Oxygen HD Audio - Asus Xonar D1] analog output device is not
  listed in audio settings

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