[issue23446] Use PyMem_New instead of PyMem_Malloc

[Stefan Krah]

Stefan Krah added the comment:

In _testbuffer.c:  ndim <= 64, so the changes aren't really necessary.
Somehow this fact needs to get widely known, since it does not make
sense to check for overflow anytime ndim is used.

The reason is of course that even an array with only 2 elements per
dimension gets quite large with ndim=64. :)

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nosy: +skrah

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