examples/io_uring-test: fix off-by-one in size checking

[piaoxuebingfeng]

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fix issue #973

this pr is to fix #973 issue

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src/queue: don't flush SQ ring for new wait interface

If we have IORING_FEAT_EXT_ARG, then timeouts are done through the
syscall instead of by posting an internal timeout. This was done
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the wait side. If we touch the SQ state by flushing it, that isn't
safe without synchronization.

Fixes: https://github.com/axboe/liburing/issues/402
Signed-off-by: Jens Axboe <[email protected]>

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[axboe]

Looks good, thanks.

[axboe]

Your commit message needs a bit of work.

First of all, the title should probably be:

examples/io_uring-test: fix off-by-one in size checking

and then it needs a Signed-off-by: name line as per the other commits you'll see in the repo.

[piaoxuebingfeng]

I have completed the modifications.