NetApp/trident: storage_drivers/azure/azure_anf.go; 15 LoC

Found a possible issue in [NetApp/trident](https://www.github.com/NetApp/trident) at [storage_drivers/azure/azure_anf.go](https://github.com/NetApp/trident/blob/62ab24d23195b6616334fb7d17fe4a629dda67fe/storage_drivers/azure/azure_anf.go#L1506-L1520)

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 1519

[Click here to see the code in its original context.](https://github.com/NetApp/trident/blob/62ab24d23195b6616334fb7d17fe4a629dda67fe/storage_drivers/azure/azure_anf.go#L1506-L1520)

Click here to show the 15 line(s) of Go which triggered the analyzer.

```go
for _, volume := range *volumes {

// Filter out volumes in an unavailable state
switch volume.ProvisioningState {
case sdk.StateDeleting, sdk.StateDeleted, sdk.StateError:
continue
}

// Filter out volumes without the prefix (pass all if prefix is empty)
if !strings.HasPrefix(volume.CreationToken, prefix) {
continue
}

channel <- &storage.VolumeExternalWrapper{Volume: d.getVolumeExternal(&volume), Error: nil}
}

```

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commit ID: 62ab24d23195b6616334fb7d17fe4a629dda67fe