Python 3.x: global C variable slp_initial_tstate used before initialisation

Originally reported by: Anselm Kruis (Bitbucket: akruis, GitHub: akruis)

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Since e5a2ecca2b08 (Make the _stackless module initialize late, bringing its initialization) the global variable slp_initial_tstate is initialized late. This is a bug, because the variable is used
in various places, even if the Python program does not import _stackless.

Fortunately the consequences are not to serious the fix is trivial.

I found this defect, during my work on pull request #21. The first version (f358b58) didn't work with Python 3.3-slp and I was able to track down the difference to this issue.

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• Bitbucket: https://bitbucket.org/stackless-dev/stackless/issue/104

Original comment by Anselm Kruis (Bitbucket: akruis, GitHub: akruis):

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Fixed in

• 3.3-slp: 5bad13c6da4c
• 3.4-slp: 0735c18807ff
• default-slp: 936510998245