aokumasan/nifcloud-additional-storage-csi-driver: pkg/cloud/cloud.go; 20 LoC

Found a possible issue in [aokumasan/nifcloud-additional-storage-csi-driver](https://www.github.com/aokumasan/nifcloud-additional-storage-csi-driver) at [pkg/cloud/cloud.go](https://github.com/aokumasan/nifcloud-additional-storage-csi-driver/blob/6c6b232c8ac40262d62cf7445c14fac963070a81/pkg/cloud/cloud.go#L355-L374)

Below is the message reported by the analyzer for this snippet of code. Beware that the analyzer only reports the first
issue it finds, so please do not limit your consideration to the contents of the below message.

> reference to volume was used in a composite literal at line 372

[Click here to see the code in its original context.](https://github.com/aokumasan/nifcloud-additional-storage-csi-driver/blob/6c6b232c8ac40262d62cf7445c14fac963070a81/pkg/cloud/cloud.go#L355-L374)

Click here to show the 20 line(s) of Go which triggered the analyzer.

```go
for _, volume := range response.DescribeVolumesOutput.VolumeSet {
// Volume name was setted in volume description.
// So use description to check this volume was created by Kubernetes CSI driver.
if !strings.HasPrefix(nifcloud.StringValue(volume.Description), "pvc-") {
continue
}

volSize, err := strconv.Atoi(nifcloud.StringValue(volume.Size))
if err != nil {
klog.Warningf("could not convert volume size %q. using 100GiB...: %v", nifcloud.StringValue(volume.Size), err)
volSize = 100
}

disks = append(disks, &Disk{
VolumeID: nifcloud.StringValue(volume.VolumeId),
CapacityGiB: int64(volSize),
AvailabilityZone: nifcloud.StringValue(volume.AvailabilityZone),
AttachedInstanceID: getVolumeAttachedInstanceID(&volume),
})
}

```

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commit ID: 6c6b232c8ac40262d62cf7445c14fac963070a81