Automatic merge from submit-queue (batch tested with PRs 59637, 60611, 60788, 60489, 60687). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
delete unused variable
delete unused variable in sio_plugin.go
**Release note**:
```
NONE
```
/release-note-none
/kink cleanup
7887fba3a5