Zbigniew Jędrzejewski-Szmek
1bdf279002
When various references to the unit were dropped during cleanup in unit_free(), add_to_gc_queue() could be called on this unit. If the unit was previously in the gc queue (at the time when unit_free() was called on it), this wouldn't matter, because it'd have in_gc_queue still set even though it was already removed from the queue. But if it wasn't set, then the unit could be added to the queue. Then after unit_free() would deallocate the unit, we would be left with a dangling pointer in gc_queue. A unit could be added to the gc queue in two places called from unit_free(): in the job_install calls, and in unit_ref_unset(). The first was OK, because it was above the LIST_REMOVE(gc_queue,...) call, but the second was not, because it was after that. Move the all LIST_REMOVE() calls down.
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