mendersoftware / mender-flash / 1893879249

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fix: Do `fsync(out_fd)` before `close(out_fd)`

`close()` doesn't guarantee a sync:

> A successful close does not guarantee that the data has been
> successfully saved to disk, as the kernel uses the buffer cache
> to defer writes.

Ticket: MEN-7862
Changelog: none
Signed-off-by: Vratislav Podzimek <vratislav.podzimek+auto-signed@northern.tech>

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