When unit_load() failed for some reasons, previously we overrided the load state with UNIT_NOT_FOUND, but we did not update the Unit.fragment_not_found_timestamp_hash. So, the unit may be loaded multiple times when the unit is in a dependency list of another unit, as manager_unit_cache_should_retry_load() will be true again even on next call. Let's not override the unit state set by unit_load(). Note, after unit_load(), the unit state should not be UNIT_STUB. Let's also add the assertion about that. This change is important when combined with the next commit, as with the next commit we will restart the FOREACH_UNIT_DEPENDENCY() loop if an unit is reloaded, hence overriding load state with UNIT_NOT_FOUND may cause infinit loop.
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