x/sys: fix trimmed socket opt string in unix/syscall_linux

[KSDaemon]

Take null-byte into account and trim only if needed. Fixes #63217

[KSDaemon]

Hi there! If you can point me and advice how to write a tests for this - I would love to do. But it seems to be hard as it involves mocking low-level syscall things...

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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[gopherbot]

Message from Tobias Klauser:

Patch Set 1:

(2 comments)

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[gopherbot]

This PR is being closed because golang.org/cl/531117 has been abandoned.

Wrong repository.