compress/gzip: always close bodyReader in Example_compressingReader
For #53362
Fixes #53414
Change-Id: I352164e70c136eed210c7ee4ceba5dc631f81f94
Reviewed-on: https://go-review.googlesource.com/c/go/+/412955
Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Joseph Tsai <joetsai@digital-static.net> Reviewed-by: Ian Lance Taylor <iant@google.com>
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