Fix signed comparison compiler warning
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@@ -1604,7 +1604,7 @@ void HistogramArea::drawParade(Cairo::RefPtr<Cairo::Context> &cr, int w, int h)
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auto orig_matrix = cr->get_matrix();
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const double display_wave_width = static_cast<double>(w) / buffers.size();
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for (int i = 0; i < buffers.size(); i++) {
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for (unsigned i = 0; i < buffers.size(); i++) {
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Cairo::RefPtr<Cairo::ImageSurface> surface;
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cr->translate(i * display_wave_width, padding);
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cr->scale(display_wave_width / wave_width, (h - 2 * padding) / wave_height);
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