NXP Backend: Fix Coverity problems in neutron backend

[jirioc]

Summary

This fixes issues reported by coverity scan.

Test plan

A compilation unit test should build successfully.

cc @robert-kalmar @JakeStevens @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18793

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• Rolling out OSDC (ARC) runners on pull workflow for PyTorch trunk commits

❌ 1 New Failure, 3 Pending

As of commit e44f47c with merge base be370a1 ():

NEW FAILURE - The following job has failed:

• pull / test-qnn-wheel-packages-linux (3.10) / linux-job (gh)
  RuntimeError: Command docker exec -t 339945d81b4c281e9aa6f64d0b4d642513d7ac964ee4a7fcb5c28e6c015754fe /exec failed with exit code 1

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