Ответ на задачу: если первая проверка не выполняется, то seg_index < first_block. Теперь, если seg_index == 0, то это означает, что first_block > 0. А дальше мы ещё раз проверяем, что first_block > 0, и анализатор справедливо подмечает, что это условие и так всегда истинно. Следовательно, выражение this->segment_size(0) никогда не выполнится.
BY PVS-Studio
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