[SSSD] [sssd PR#5816][opened] debug: fix unused variable warnings

[pbrezina]

   URL: https://github.com/SSSD/sssd/pull/5816
Author: pbrezina
 Title: #5816: debug: fix unused variable warnings
Action: opened

PR body:
"""
```
/home/pbrezina/workspace/sssd/src/util/debug.c: In function ‘sss_vdebug_fn’:
/home/pbrezina/workspace/sssd/src/util/debug.c:274:11: error: unused variable ‘result_fmt’
[-Werror=unused-variable]
  274 |     char *result_fmt;
      |           ^~~~~~~~~~
/home/pbrezina/workspace/sssd/src/util/debug.c:273:11: error: unused variable
‘chain_id_fmt_dyn’ [-Werror=unused-variable]
  273 |     char *chain_id_fmt_dyn = NULL;
      |           ^~~~~~~~~~~~~~~~
/home/pbrezina/workspace/sssd/src/util/debug.c:272:10: error: unused variable
‘chain_id_fmt_fixed’ [-Werror=unused-variable]
  272 |     char chain_id_fmt_fixed[256];

```

Introduced in: 3d8dd1282ffb7d0188e36d0109340ce622745717
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/5816/head:pr5816
git checkout pr5816