status: fix possible index out of bounds in cpu sampling

[yuzefovich]

This commit fixes a possible index out of bounds crash that could previously occur when cpu.Times returned an error when sampling runtime stats. The bug was introduced in 4b9a337.

Fixes: #120129.

Release note: None

[blathers-crl]

It looks like your PR touches production code but doesn't add or edit any test code. Did you consider adding tests to your PR?

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[cockroach-teamcity]

This change is 

[dhartunian]

thanks for this!

Reviewable status: complete! 1 of 0 LGTMs obtained

[yuzefovich]

TFTR!

bors r+

[craig]

Build succeeded:

• linux_amd64_fips_build
• macos_arm64_build
• check_generated_code
• linux_amd64_build
• lint
• local_roachtest_fips
• windows_build
• examples_orms
• local_roachtest
• linux_arm64_build
• macos_amd64_build
• acceptance
• docker_image_amd64
• unit_tests

[blathers-crl]

Encountered an error creating backports. Some common things that can go wrong:

1. The backport branch might have already existed.
2. There was a merge conflict.
3. The backport branch contained merge commits.

You might need to create your backport manually using the backport tool.

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Backport to branch 23.1.x failed. See errors above.

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Backport to branch 23.2.x failed. See errors above.

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error setting reviewers, but backport branch blathers/backport-release-24.1-123891 is ready: POST https://api.github.com/repos/cockroachdb/cockroach/pulls/123902/requested_reviewers: 422 Reviews may only be requested from collaborators. One or more of the teams you specified is not a collaborator of the cockroachdb/cockroach repository. []

Backport to branch 24.1.x failed. See errors above.

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