return NULL when the requested allocation is too large

[folkertdev]

cc @Shnatsel

[codecov]

Codecov Report

❌ Patch coverage is 68.18182% with 7 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
zlib-rs/src/allocate.rs	68.18%	7 Missing ⚠️

Flag	Coverage Δ
fuzz-compress	39.88% <0.00%> (-0.02%)	⬇️
fuzz-decompress	27.07% <0.00%> (+0.10%)	⬆️
test-aarch64-apple-darwin	89.53% <63.63%> (-0.08%)	⬇️
test-aarch64-unknown-linux-gnu	85.33% <63.63%> (-0.06%)	⬇️
test-i686-unknown-linux-gnu	85.04% <59.09%> (-0.09%)	⬇️
test-x86_64-apple-darwin	88.90% <63.63%> (-0.05%)	⬇️
test-x86_64-unknown-linux-gnu	90.93% <63.63%> (-0.07%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
zlib-rs/src/allocate.rs	95.13% <68.18%> (-2.43%)	⬇️

... and 3 files with indirect coverage changes

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