[SSSD] [sssd PR#927][opened] Add processing to save errno before outputting DEBUG

[miztake]

   URL: https://github.com/SSSD/sssd/pull/927
Author: miztake
 Title: #927: Add processing to save errno before outputting DEBUG
Action: opened

PR body:
"""
In some processes, DEBUG is output after a system call error, and errno is returned.
errno should be saved before DEBUG is output.
Add a process to save errno before outputting DEBUG so that errno is not overwritten in
DEBUG output process.
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/927/head:pr927
git checkout pr927