Remove unused-variable in deeplearning/fbgemm/fbgemm_gpu/src/jagged_tensor_ops/jagged_unique_indices.cu +1

[q10]

Summary: LLVM-15 has a warning -Wunused-variable which we treat as an error because it's so often diagnostic of a code issue. Unused variables can compromise readability or, worse, performance.

This diff either (a) removes an unused variable and, possibly, it's associated code or (b) qualifies the variable with [[maybe_unused]].

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Reviewed By: q10

Differential Revision: D72588935

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This pull request was exported from Phabricator. Differential Revision: D72588935

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