some similar functions

[Tomaz Canabrava]

int get_index_for_dive(struct dive *dive) {
    int i;
    struct dive *d;
    for_each_dive(i, d)
        if (d == dive)
            return i;
    return -1;
}

int get_divenr(struct dive *dive)
{
    int divenr = -1;
    while (++divenr < dive_table.nr && get_dive(divenr) != dive)
        ;
    return divenr;
}

Safe to remove one of them both?
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