lxc/lxd: lxd/storage_volumes_snapshot.go; 37 LoC

Found a possible issue in [lxc/lxd](https://www.github.com/lxc/lxd) at [lxd/storage_volumes_snapshot.go](https://github.com/lxc/lxd/blob/bf9cd0f88f0f68e2620676f9457b07515caf8cf5/lxd/storage_volumes_snapshot.go#L740-L776)

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.

> range-loop variable v used in defer or goroutine at line 743

[Click here to see the code in its original context.](https://github.com/lxc/lxd/blob/bf9cd0f88f0f68e2620676f9457b07515caf8cf5/lxd/storage_volumes_snapshot.go#L740-L776)

Click here to show the 37 line(s) of Go which triggered the analyzer.

```go
for _, v := range volumes {
ch := make(chan error)
go func() {
snapshotName, err := volumeDetermineNextSnapshotName(d, v, "snap%d")
if err != nil {
logger.Error("Error retrieving next snapshot name", log.Ctx{"err": err, "volume": v})
ch <- nil
return
}

expiry, err := shared.GetSnapshotExpiry(time.Now(), v.Config["snapshots.expiry"])
if err != nil {
logger.Error("Error getting expiry date", log.Ctx{"err": err, "volume": v})
ch <- nil
return
}

pool, err := storagePools.GetPoolByName(d.State(), v.PoolName)
if err != nil {
logger.Error("Error retrieving pool", log.Ctx{"err": err, "pool": v.PoolName})
ch <- nil
return
}

err = pool.CreateCustomVolumeSnapshot(v.ProjectName, v.Name, snapshotName, expiry, nil)
if err != nil {
logger.Error("Error creating volume snapshot", log.Ctx{"err": err, "volume": v})
}

ch <- nil
}()
select {
case <-ctx.Done():
return nil
case <-ch:
}
}

```

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See the descriptions of the classifications [here](https://github.com/github-vet/rangeclosure-findings#how-can-i-help) for more information.

commit ID: bf9cd0f88f0f68e2620676f9457b07515caf8cf5