Fix erroneous semicolons with void returns

[cruzzil]

Fixed lints from clippy::semicolon_if_nothing_returned

[codecov]

Codecov Report

❌ Patch coverage is 68.00000% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
lib/decompress/zstd_decompress_block.rs	60.00%	2 Missing ⚠️
lib/dictBuilder/fastcover.rs	0.00%	2 Missing ⚠️
lib/common/pool.rs	50.00%	1 Missing ⚠️
lib/compress/zstd_compress.rs	0.00%	1 Missing ⚠️
lib/compress/zstd_compress_literals.rs	0.00%	1 Missing ⚠️
lib/dictBuilder/zdict.rs	50.00%	1 Missing ⚠️

Flag	Coverage Δ
test-aarch64-apple-darwin	33.44% <65.21%> (-0.02%)	⬇️
test-aarch64-unknown-linux-gnu	31.65% <65.21%> (-0.01%)	⬇️
test-i686-unknown-linux-gnu	31.71% <66.66%> (-0.02%)	⬇️
test-x86_64-unknown-linux-gnu	33.29% <68.00%> (-0.01%)	⬇️

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

Files with missing lines	Coverage Δ
lib/common/allocations.rs	82.92% <100.00%> (ø)
lib/common/mem.rs	96.87% <100.00%> (ø)
lib/common/xxhash.rs	96.46% <100.00%> (ø)
lib/decompress/zstd_decompress.rs	60.79% <100.00%> (-0.04%)	⬇️
lib/dictBuilder/cover.rs	80.90% <100.00%> (ø)
lib/legacy/zstd_v07.rs	69.65% <100.00%> (+0.01%)	⬆️
lib/polyfill.rs	90.69% <100.00%> (ø)
lib/common/pool.rs	59.24% <50.00%> (ø)
lib/compress/zstd_compress.rs	37.73% <0.00%> (ø)
lib/compress/zstd_compress_literals.rs	70.56% <0.00%> (ø)
... and 3 more

... and 4 files with indirect coverage changes

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[cruzzil]

@folkertdev anything pending on this one?

[folkertdev]

I don't really like how this looks. It's a nonstandard lint