zlib
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Remove double checks in preprocessing and runtime
Please provide a short description and rationale for the changes. Thanks.
Conditions zi->ci.method == Z_DEFLATED in line 1421 was rechecked in 1424.
Similarly, for zi->ci.method == Z_BZIP2ED.
Fewer conditional compilation directives; overall the code gets shorter and clearer.
Reason for removed pointer operation is in the comment.