[SSSD] [sssd PR#968][comment] util/sss_ptr_hash: fixed double free in sss_ptr_hash_delete_cb()

[alexey-tikhonov]

URL: https://github.com/SSSD/sssd/pull/968
Title: #968: util/sss_ptr_hash: fixed double free in sss_ptr_hash_delete_cb()

alexey-tikhonov commented:
"""
> This was introduced by [f95db37](https://github.com/SSSD/sssd/commit/f95db37aa8486304d0569d12a876b1c74ee1b0d1) which is not in `sssd-1-16` however it is a valid bug that needs to be addresses in 1.16 as well for autofs use case. Alexey, could you open a new PR against `sssd-1-16` that would cherry-pick [f95db37](https://github.com/SSSD/sssd/commit/f95db37aa8486304d0569d12a876b1c74ee1b0d1) and your patch?

PR970. I squashed two commits.

"""

See the full comment at https://github.com/SSSD/sssd/pull/968#issuecomment-574245133