[issue6428] TypeError: __bool__ should return bool or int, returned int

[Eric Smith]

Eric Smith <eric at trueblade.com> added the comment:

The patch looks good to me. In particular, removing the test for
using_len looks correct.

The assignment of "result = -1" after PyErr_Format isn't needed, but
doesn't hurt (and it was already there, anyway).

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keywords:  -needs review
nosy: +eric.smith

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