[issue28994] Misc fixes and cleanups in error handling C code

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Last time Objects/listobject.c was changed 2 months ago. This looks as an error in your workspace. Maybe something wrong happened when you switched from master to 3.6.

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<http://bugs.python.org/issue28994>
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