Clean up `select {}`

[CatherineF-dev]

What this PR does / why we need it:

How does this change affect the cardinality of KSM: (increases, decreases or does not change cardinality) N/A

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #

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[CatherineF-dev]

cc @mrueg to review.

Does this select {} have some special purposes?

[dashpole]

/assign @rexagod /triage accepted

[mrueg]

AFAIK the select here is used to block similar to an infinite for loop.

[rexagod]

Yep, closing.