[issue29034] Fix memory leak in path_converter

[STINNER Victor]

STINNER Victor added the comment:

> The logic is complex ...

Yeah, that's why I first proposed to add a dummy to_cleanup2 object.

Another option is to use your first patch.

I don't care much about the exact implementation :-) Maybe Serhiy has
a better understanding of the code and can help to decide on this
issue ;-)

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<http://bugs.python.org/issue29034>
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