[SSSD] [sssd PR#5560][opened] pam_sss: fixed potential mem leak

[alexey-tikhonov]

URL: https://github.com/SSSD/sssd/pull/5560
Author: alexey-tikhonov
 Title: #5560: pam_sss: fixed potential mem leak
Action: opened

PR body:
"""
Fixes following covscan issue:
```
Error: RESOURCE_LEAK (CWE-772): [#def1]
src/sss_client/pam_sss.c:1714: alloc_arg: "asprintf" allocates memory that is stored into "prompt".
src/sss_client/pam_sss.c:1765: leaked_storage: Variable "prompt" going out of scope leaks the storage it points to.
 # 1763|       free(response);
 # 1764|
 # 1765|->     return ret;
 # 1766|   #else
 # 1767|       return ENOTSUP;
```

https://bugzilla.redhat.com/show_bug.cgi?id=1938876
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/5560/head:pr5560
git checkout pr5560