fix: max_unpool3d buffer overflow

[Kristoff-starling]

Fixes #88032

Previously output_size is accessed before the shape length check, which leads to a buffer overflow issue.

The fix is simply to prioritize the check.

[pytorch-bot]

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• ✅ login: Kristoff-starling / name: Yuyao Wang (abe8502)

[Kristoff-starling]

Hi, @albanD I brought a PR as we discussed in issue #88032. Could you help take a look? Thanks!

[albanD]

Thanks a lot for taking the time to send a PR for this!
Looks great!

[albanD]

@pytorchbot merge

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