[issue25410] Clean up and fix OrderedDict

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Seems there is a leak in _odict_add_new_node() when PyObject_Hash(key) fails. Here is a fix.

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stage: commit review -> patch review
Added file: http://bugs.python.org/file40817/odict_add_new_node_leak.patch

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<http://bugs.python.org/issue25410>
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