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db8b91980b
Fix regression introduced in a7bfb9f76b,
where busy loop can be started with a request for following logs with a
range header set with num_skip value pointing beyond the end of the
journal. In that case the reader callback returns 0 and is called
immediately again, usually causing an endless loop that is not recovered
even when new journal events are added.
The bug does not occur if num_skip is not set - in that case if no
journal entries matching the filters are added, the tight loop is
avoided by the sd_journal_wait().
To fix the issue, when no matching journal events are available, set a
flag and reuse the backoff mechanism using the sd_journal_wait().
Link: https://github.com/home-assistant/operating-system/issues/4190