Make sure that D-Bus connection pointer is set to NULL when last reference is destroyed so we don't access invalid pointer.
Related to: https://pagure.io/SSSD/sssd/issue/3367
Adding to 1.15.4 so that we don't forget to check the code..
Metadata Update from @jhrozek:
- Issue priority set to: minor
- Issue set to the milestone: SSSD 1.15.4
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2.14.2 — Documentation