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Fix e2e-node test panic
Signed-off-by: Yanqiang Miao <miao.yanqiang@zte.com.cn>



**What this PR does / why we need it**:
Execute e2e-node test locally like:
```bash
# make test-e2e-node FOCUS="should assign CPUs as expected based on the Pod spec" SKIP=""
```
received a panic see #57889
This pr fixes the panic.

**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 #57889

**Special notes for your reviewer**:

**Release note**:

```release-note
none
```