fix ineffectual assignment to err

[zhouhao3]

Signed-off-by: Zhou Hao zhouhao@cn.fujitsu.com

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[k8s-ci-robot]

Hi @zhouhao3. Thanks for your PR.

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[christopherhein]

/ok-to-test

[christopherhein]

/lgtm /approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: christopherhein, zhouhao3

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Needs approval from an approver in each of these files: - ~~[virtualcluster/OWNERS](https://github.com/kubernetes-sigs/cluster-api-provider-nested/blob/master/virtualcluster/OWNERS)~~ [christopherhein] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment