535b7fcb44
This function was returning 0 or 1 on success. It has many callers, and it wasn't clear if any of them care about the distinction. It turns out they don't and the return values were done for convenience because manager_load_unit_prepare() returns 0 or 1. Let's invert the code in the static function to follow the usual pattern where 0 means "no work was done" and 1 means "work was done", and make the non-static function always return 0 to make the code easier to read, and also add comments that explain what is happening. No functional change.
System and Service Manager
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