read-mshot.t: test with differing buffer size

[DylanZA]

This patch adds a check for differing buffer sizes, and amkes sure that the returned size is correct.

This fails currently, but should work with https://lore.kernel.org/io-uring/20231105223008.125563-1-dyudaken@gmail.com/T/#t

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git request-pull output:

The following changes since commit 78eef455c9538cbc145d7c658367f7662aeba39a:

  liburing.spec: move to minor 6 (2023-11-04 15:15:11 -0600)

are available in the Git repository at:

  https://github.com/dylanZA/liburing fix1

for you to fetch changes up to 3df9b683d12e1c6bb68e48bfccaf9befddc86be9:

  read-mshot.t: test with differing buffer size (2023-11-05 22:33:16 +0000)

----------------------------------------------------------------
Dylan Yudaken (1):
      read-mshot.t: test with differing buffer size

 test/read-mshot.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

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[axboe]

For some reason I had missed this one, merged now, thanks!