[issue12604] VTRACE macro in _sre.c should use do {} while (0)

[Petri Lehtinen]

Changes by Petri Lehtinen <petri at digip.org>:


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components: +Build, Library (Lib)
keywords: +needs review
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12604>
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