* Fixes a stack overflow in the h5dump test generator
The opaque type size was declared to be the size of the "buffer of two
opaque elements", causing a memcpy call in H5Dwrite to read outside
the buffer, dumping garbage into the file.
Note that this only affected the test generator and not h5dump itself.
* Committing clang-format changes
Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>
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