7f7d01ed5804afef220ebdb29f22d8177d0d3a5c
No functional change. The source unit manages the reference. It allocates the UnitRef structure and registers it in the target unit, and then the reference must be destroyed before the source unit is destroyed. Thus, is should be OK to include the pointer to the source unit, it should be live as long as the reference exists. v2: - rename refs to refs_by_target
systemd - System and Service Manager
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