small_5 9139ad4685 luci-app-ddns: fix update time calculation
* Fix last_update overflow

* Fix next_update wrong when the router is just started

* Fix missing check_seconds for next_update

Signed-off-by: Small_5 <61473216+small-5@users.noreply.github.com>
(cherry picked from commit 58ed2b211a1add5fb2cb3750af6074c4d51c307a)
2022-05-03 15:53:25 +02:00
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