[issue5108] Invalid UTF-8 ("%s") length in PyUnicode_FromFormatV()

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> The problem with your patch is that it calls PyUnicode_DecodeUTF8() 
twice

I read your patch: storing the decoded string is the right way to do 
that, but i didn't noticed the "callresult stack".

> Could you test this new version to see if there's still a Valgrind 
report?

I will try to reproduce the crash using my Python fuzzer (Fusil). But 
it looks better (and valid).

Thanks.

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