fix bug in write mode in bzopen_or_bzdopen

[folkertdev]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
fuzz-compress_then_decompress	49.17% <0.00%> (-2.06%)	⬇️
fuzz-decompress_chunked	30.94% <0.00%> (-2.91%)	⬇️
test-aarch64-apple-darwin	89.56% <100.00%> (+0.06%)	⬆️
test-aarch64-unknown-linux-gnu	89.40% <100.00%> (+0.07%)	⬆️
test-i686-unknown-linux-gnu	?
test-x86_64-apple-darwin	89.56% <100.00%> (+0.06%)	⬆️
test-x86_64-unknown-linux-gnu	89.56% <100.00%> (+0.06%)	⬆️

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Files with missing lines	Coverage Δ
libbz2-rs-sys/src/high_level.rs	82.20% <100.00%> (ø)
test-libbz2-rs-sys/src/lib.rs	95.55% <100.00%> (+0.21%)	⬆️

... and 1 file with indirect coverage changes

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[folkertdev]

subsumed by other PRs