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fix incorrect comparison in /pkg/volume error message
Signed-off-by: allencloud <allen.sun@daocloud.io>
**What this PR does / why we need it**:
This PR fixes incorrect error message when there is comparison.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
NONE
**Special notes for your reviewer**:
NONE
**Release note**:
```release-note
NONE
```
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