9e5bd85a5fc5d80cc8706d2b8bac520f2c6a8149
When vsnprintf() truncated output, dest was advanced by the entire size of dest leaving it just past the end. Then the fall-through \0 termination scribbled one past the end. The explicit null termination is not necessary since vsnprintf() always includes the terminator even when truncated. Additionally these functions encourage calling with zero-length sizes, while assuming non-zero sizes with potential buffer overflows. Simply short-circuit the relevant functions when size == 0. Fixes https://github.com/systemd/systemd/issues/6252
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