Add test case for error found by fuzzer for ZDICT_trainFromBuffer_legacy

[michielp1807]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 89.01099% with 10 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
lib/dictBuilder/zdict.rs	89.01%	10 Missing ⚠️

Flag	Coverage Δ
test-aarch64-apple-darwin	33.69% <89.01%> (+0.18%)	⬆️
test-aarch64-unknown-linux-gnu	31.69% <89.01%> (+0.15%)	⬆️
test-i686-unknown-linux-gnu	31.74% <89.01%> (+0.13%)	⬆️
test-x86_64-unknown-linux-gnu	33.76% <89.01%> (+0.18%)	⬆️

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Files with missing lines	Coverage Δ
lib/dictBuilder/zdict.rs	77.27% <89.01%> (+7.09%)	⬆️

... and 5 files with indirect coverage changes

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