Fix verify_backlog start verification before finish writing

Due to recent fix for checking rand_seed in verify phase. In write phase,
the IO transaction will be logged before completing the actual data write.
If verify_backlog is enabled, verification may start before all data has
been written. This patch disable that fix if the verify_backlog is enabled.

Signed-off-by: Puthikorn Voravootivat <puthik@chromium.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
2 files changed