[Rpm-maint] [rpm-software-management/rpm] Turn nrefs into atomic_int (PR #3370)

[Florian Festi]

Yes, this was an issue in the previous code as it did the comparison first and then decided what to do. This here is different. If nrefs reaches 0 it is no longer allowed to change as no one should have a reference. So if the -- returns zero there is no longer a race going on. So we can do the comparison later and then free the instance in peace.  

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