fix staticcheck:pkg/volume/cinder

Signed-off-by: yuxiaobo <[email protected]>

Author: yuxiaobo96

hack/.staticcheck_failures

@@ -28,7 +28,6 @@ pkg/volume
 pkg/volume/awsebs
 pkg/volume/azure_dd
 pkg/volume/azure_file
-pkg/volume/cinder
 pkg/volume/csi
 pkg/volume/emptydir
 pkg/volume/fc

pkg/volume/cinder/cinder.go

@@ -362,15 +362,11 @@ type cinderVolume struct {
 	pdName string
 	// Filesystem type, optional.
 	fsType string
-	// Specifies whether the disk will be attached as read-only.
-	readOnly bool
 	// Utility interface that provides API calls to the provider to attach/detach disks.
 	manager cdManager
 	// Mounter interface that provides system calls to mount the global path to the pod local path.
 	mounter mount.Interface
-	// diskMounter provides the interface that is used to mount the actual block device.
-	blockDeviceMounter mount.Interface
-	plugin             *cinderPlugin
+	plugin  *cinderPlugin
 	volume.MetricsProvider
 }