[issue3640] test_cpickle crash on AMD64 Windows build

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

Can someone have a look at this patch?
It is not 64bit nor Windows specific; its goal is to reduce the size of 
local variables in batch_list(), which is easy to verify.

The point is to check the correctness of the code, specially around 
errors checks and reference counting.

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<http://bugs.python.org/issue3640>
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