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defer func of kubelet volume testing
**What this PR does / why we need it**:
there has some defer func ,I think maybe modify better,thanks!
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
9e792173d0