[issue10509] PyTokenizer_FindEncoding can lead to a segfault if bad characters are found

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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nosy: +ezio.melotti
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10509>
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