Fix prefix-cache-scorer benchmark panic

[Frapschen]

What type of PR is this?
/kind test

What this PR does / why we need it:

Fix prefix-cache-scorer benchmark panic

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

@Frapschen: The label(s) kind/test cannot be applied, because the repository doesn't have them.

In response to this:

What type of PR is this?
/kind test

What this PR does / why we need it:

Fix prefix-cache-scorer benchmark panic

Does this PR introduce a user-facing change?:

NONE

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Frapschen
Once this PR has been reviewed and has the lgtm label, please assign kfswain for approval. For more information see the Code Review Process.

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[danehans]

@Frapschen can you create an issue that describes the bug that this PR fixes?