73ce91a05a
The function returns non-negative UnitNameFlags on success, and negative errno on error. In the past we kept the return type as int because of those negative return values. But nowadays _UNIT_NAME_INVALID == -EINVAL. And if we tried to actually return something that doesn't fit in the return type, the compiler would throw an error. By changing to the "real" return type, we allow the debugger to use symbolic representation for the variables.
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