Remove redundant casts

[FranciscoTGouveia]

I believe these casts can be safely removed, as the source type is already the target type.

For reference, these changes were found by an optimizer developed as a research project.

CC @nunoplopes

[Copilot]

Pull request overview

This PR removes redundant as usize casts when adding the result of read_integer(...) to literal_length and match_length during safe block decompression. This aligns the call sites with read_integer’s existing return type (Result<usize, DecompressError>), keeping the decompression logic unchanged while simplifying the code.

Changes:

• Removed as usize casts after read_integer(input, &mut input_pos)? when updating literal_length.
• Removed as usize casts after read_integer(input, &mut input_pos)? when updating match_length.

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