Cleanup in get_enum_from_fn

[GdoongMathew]

fix #8847

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/8852

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❌ 5 New Failures, 1 Unrelated Failure

As of commit 73db4d4 with merge base 06a925c ():

NEW FAILURES - The following jobs have failed:

• Tests / unittests-linux (3.10, linux.12xlarge, cpu) / linux-job (gh)
  RuntimeError: Command docker exec -t 12a1e9b1ce569d312387f2812dc5af86010480a92cdee1dbd0ffe92d4d35be0f /exec failed with exit code 1
• Tests / unittests-linux (3.11, linux.12xlarge, cpu) / linux-job (gh)
  RuntimeError: Command docker exec -t 335986106fdc4b8c51a61d7495817dcdcff61bf40b6239a437e37399a713f8cc /exec failed with exit code 1
• Tests / unittests-linux (3.12, linux.12xlarge, cpu) / linux-job (gh)
  RuntimeError: Command docker exec -t 98aae9fd468dd0522f91bb192c969f720b2ca61e549c2191a7715142502ec94e /exec failed with exit code 1
• Tests / unittests-linux (3.9, linux.12xlarge, cpu) / linux-job (gh)
  RuntimeError: Command docker exec -t 64565aa6d454e088dede75c3b9f60d137a777e6b5579642d36a3d10c885676ca /exec failed with exit code 1
• Tests / unittests-macos (3.11, macos-m1-stable) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Tests / unittests-windows (3.9, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job (gh) (trunk failure)
  AttributeError: '_OpNamespace' 'image' object has no attribute '_jpeg_version'

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