[issue18408] Fixes crashes found by pyfailmalloc

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

listpop.patch:

list_resize(a, Py_SIZE(a) + d) for d < 0 fails only when PyMem_Realloc(p, n) returns NULL if n < allocated size. Is it possible? Is it desired behavior? Perhaps we should declare that PyMem_Realloc() should return the original pointer if it can't shrink an allocated block.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18408>
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