[mesi] Remove dead branch in EsiParserConfig.DecreaseMaxDepth#157
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MaxDepth is uint, so the else branch (c.MaxDepth = 0) was unreachable — c.MaxDepth > 0 is false only when c.MaxDepth == 0, making the assignment a no-op. Simplify to c.MaxDepth-- guarded by the existing check. Add boundary test for math.MaxUint to document no-wraparound intent.
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Closes #112
Summary
elsebranch inDecreaseMaxDepth—MaxDepthisuint, so theelse(c.MaxDepth = 0) was a no-opc.MaxDepth = c.MaxDepth - 1to idiomaticc.MaxDepth--math.MaxUint → math.MaxUint - 1to document no-wraparound intentAll existing tests pass.