Fix typo in sub & clean up

[pytorchbot]

Differential Revision: D56255838

[pytorch-bot[bot]]

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:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3253

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As of commit 8adbfd959f77c30ef4cff77fc80025f8f29fe04c with merge base d3326a2073dee7baf78044fb3afd0772edbc616a (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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