[issue3977] Check PyInt_AsSsize_t/PyLong_AsSsize_t error

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Fix _bytesio of Python 2.6.

Added file: http://bugs.python.org/file11617/py26_bytesio.patch

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<http://bugs.python.org/issue3977>
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