Fix warning
../../src/hb-ot-layout-gsubgpos-private.hh:391:18: warning: missed loop optimization, the loop counter may overflow [-Wunsafe-loop-optimizations]
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@ -388,7 +388,7 @@ struct hb_ot_apply_context_t :
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inline bool prev (void)
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{
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assert (num_items > 0);
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while (idx >= num_items)
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while (idx > num_items - 1)
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{
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idx--;
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const hb_glyph_info_t &info = c->buffer->out_info[idx];
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