compress/gzip: avoid error loss in Write and Flush

[kirillgrachoff]

golangci-lint reports an error in this file.

The error "returned error is not checked" is printed.

Fixes #67191

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Patch Set 1:

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[gopherbot]

Message from Ian Lance Taylor:

Patch Set 3:

(1 comment)

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