Use T::from instead of cast where expected to be lossless.

[petesmc]

Fix lints from clippy::cast_lossless

[codecov]

Codecov Report

❌ Patch coverage is 38.98432% with 817 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
programs/zstdcli.rs	0.00%	91 Missing ⚠️
lib/compress/zstd_lazy.rs	0.00%	77 Missing ⚠️
lib/compress/zstd_compress.rs	60.00%	66 Missing ⚠️
lib/legacy/zstd_v05.rs	43.26%	59 Missing ⚠️
lib/legacy/zstd_v06.rs	51.63%	59 Missing ⚠️
programs/fileio.rs	0.00%	58 Missing ⚠️
lib/compress/zstd_opt.rs	0.00%	53 Missing ⚠️
programs/util.rs	0.00%	50 Missing ⚠️
lib/compress/zstd_ldm.rs	0.00%	46 Missing ⚠️
programs/benchzstd.rs	0.00%	44 Missing ⚠️
... and 26 more

Flag	Coverage Δ
test-aarch64-apple-darwin	33.19% <38.84%> (-0.23%)	⬇️
test-aarch64-unknown-linux-gnu	?
test-i686-unknown-linux-gnu	?
test-x86_64-unknown-linux-gnu	32.99% <37.86%> (+0.04%)	⬆️

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

Files with missing lines	Coverage Δ
lib/common/bitstream.rs	97.25% <100.00%> (-0.79%)	⬇️
lib/common/fse.rs	54.54% <100.00%> (ø)
lib/common/fse_decompress.rs	94.63% <100.00%> (-1.66%)	⬇️
lib/dictBuilder/cover.rs	80.73% <100.00%> (-0.10%)	⬇️
lib/dictBuilder/fastcover.rs	78.86% <100.00%> (ø)
lib/common/mem.rs	75.78% <50.00%> (-2.11%)	⬇️
lib/common/zstd_common.rs	0.00% <0.00%> (ø)
lib/compress/hist.rs	74.39% <66.66%> (ø)
lib/compress/zstd_preSplit.rs	65.58% <80.00%> (ø)
lib/decompress/huf_decompress.rs	77.11% <91.66%> (-2.28%)	⬇️
... and 31 more

... and 3 files with indirect coverage changes

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