Remove unused-but-set variables in velox/common/caching/tests/SsdFileTest.cpp +15

[r-barnes]

Summary: This diff removes a variable that was set, but which was not used.

LLVM-15 has a warning -Wunused-but-set-variable which we treat as an error because it's so often diagnostic of a code issue. Unused but set variables often indicate a programming mistake, but can also just be unnecessary cruft that harms readability and performance.

Removing this variable will not change how your code works, but the unused variable may indicate your code isn't working the way you thought it was. I've gone through each of these by hand, but mistakes may have slipped through. If you feel the diff needs changes before landing, please commandeer and make appropriate changes: there are hundreds of these and responding to them individually is challenging.

For questions/comments, contact r-barnes.

• If you approve of this diff, please use the "Accept & Ship" button :-)

Differential Revision: D56887334

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This pull request was exported from Phabricator. Differential Revision: D56887334

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This pull request was exported from Phabricator. Differential Revision: D56887334

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This pull request has been automatically marked as stale because it has not had recent activity. If you'd still like this PR merged, please comment on the PR, make sure you've addressed reviewer comments, and rebase on the latest main. Thank you for your contributions!