mendersoftware / mender / 2745152053

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chore: Make JsonLogMessagesReader::Rewind() a noop before first read

There is nothing to rewind if there was nothing read so far. This
way `JsonLogMessagesReader::Rewind()` can be called in the logs
body generator without worrying if there was anything read
already or not.

A rewind before first read had no effect even without these
changes, but now it's clearly and explicitly skipped, saving some
unnecessary operations.

Ticket: MEN-10017
Changelog: None
Signed-off-by: Vratislav Podzimek <vratislav.podzimek+auto-signed@northern.tech>
(cherry picked from commit 4ca4f2490)

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