[issue34912] Update overflow checks in resize_buffer

[Stefan Behnel]

Stefan Behnel <stefan_ml at behnel.de> added the comment:

If I understand the code right, "PY_SSIZE_T_MAX/sizeof(Py_UCS4)" would not be correct since it would unnecessarily limit the length of ASCII-only unicode strings.

I think the initial check avoids the risk of integer overflow in the calculations below, so it's not entirely redundant.

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nosy: +scoder

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