[issue27662] Check against PY_SSIZE_T_MAX instead of PY_SIZE_MAX in List_New

[Mark Dickinson]

Mark Dickinson added the comment:

Also, if you're switching to `PyMem_Calloc`, I'd suggest dropping the assertion at the end, since that's now really an assertion for logic that appears in `PyMem_Calloc` rather than in this function.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27662>
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