[3.13] gh-127667: fix memory leaks in hashlib (GH-127668)
#130784
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- Correctly handle `NULL` values returned by `EVP_MD_CTX_md`. - Correctly free resources in error branches. - Consistently suppress `_setException()` return value when needed. - Collapse `_setException() + return NULL` into a single statement.
picnixz
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bp/313/097846502b7f33cb327d512e2a396acf4f4de46e-hashlib-leaks-127668
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NULLvalues returned byEVP_MD_CTX_md._setException()return value when needed._setException() + return NULLinto a single statement.(cherry-picked from commit 0978465)
hashlib#127667