[Bug libc/26022] valgrind gives me error when fwprintf in stderr

["daffra.claudio at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26022

--- Comment #4 from Claudio Daffra <daffra.claudio at gmail dot com> ---
file to reproduce valgrind error

  #include <stdio.h>
  #include <wchar.h>

  int main ( void )
  {
   return 0 ;
  }

error message

  ==1596== Memcheck, a memory error detector
  ==1596== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
  ==1596== Using Valgrind-3.16.0.GIT and LibVEX; rerun with -h for copyright
info
  ==1596== Command: ./prova
  ==1596== 
  ==1596== 
  ==1596== HEAP SUMMARY:
  ==1596==     in use at exit: 13,697 bytes in 158 blocks
  ==1596==   total heap usage: 172 allocs, 14 frees, 18,441 bytes allocated
  ==1596== 
  ==1596== LEAK SUMMARY:
  ==1596==    definitely lost: 0 bytes in 0 blocks
  ==1596==    indirectly lost: 0 bytes in 0 blocks
  ==1596==      possibly lost: 4,392 bytes in 5 blocks
  ==1596==    still reachable: 9,305 bytes in 153 blocks
  ==1596==         suppressed: 0 bytes in 0 blocks
  ==1596== Rerun with --leak-check=full to see details of leaked memory
  ==1596== 
  ==1596== For lists of detected and suppressed errors, rerun with: -s
  ==1596== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 4 from 4)
  claudio@RastanX Documents % 

compiler version

  claudio@RastanX Documents % gcc -v

  Configured with: --prefix=/Library/Developer/CommandLineTools/usr
--with-gxx-include-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/4.2.1
  Apple clang version 11.0.3 (clang-1103.0.32.59)
  Target: x86_64-apple-darwin19.5.0
  Thread model: posix
  InstalledDir: /Library/Developer/CommandLineTools/usr/bin

s.o : macOS 10.15.5 (19F96)


with --leak-check=full valgrind gives me many other errors.
this occurs in macosx only,nothing to do with streams.

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