Yu Watanabe
80ec3db5c7
When there is no matching entry stored in journal, then initial call of `sd_journal_previous()` following `sd_journal_seek_tail()` returns zero, and does not move the read pointer. In the main loop, on every journal event, we call `sd_journal_next()`, even though the current location is tail, and it takes no effect. In such a case, we need to call `sd_journal_previous()` instead of `sd_journal_next()`.
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