projectcalico/cni-plugin: pkg/plugin/plugin.go; 21 LoC

Found a possible issue in [projectcalico/cni-plugin](https://www.github.com/projectcalico/cni-plugin) at [pkg/plugin/plugin.go](https://github.com/projectcalico/cni-plugin/blob/61de8217d21637a9b556193cc4ff7a2e746d78cf/pkg/plugin/plugin.go#L243-L263)

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 ep is reassigned at line 255

[Click here to see the code in its original context.](https://github.com/projectcalico/cni-plugin/blob/61de8217d21637a9b556193cc4ff7a2e746d78cf/pkg/plugin/plugin.go#L243-L263)

Click here to show the 21 line(s) of Go which triggered the analyzer.

```go
for _, ep := range endpoints.Items {
var match bool
match, err = wepIDs.WorkloadEndpointIdentifiers.NameMatches(ep.Name)
if err != nil {
// We should never hit this error, because it should have already been
// caught by CalculateWorkloadEndpointName.
err = fmt.Errorf("invalid WorkloadEndpoint identifiers: %v", wepIDs.WorkloadEndpointIdentifiers)
return
}

if match {
logger.Debugf("Found a match for WorkloadEndpoint: %v", ep)
endpoint = &ep
// Assign the WEP name to wepIDs' WEPName field.
wepIDs.WEPName = endpoint.Name
// Put the endpoint name from the matched WEP in the identifiers.
wepIDs.Endpoint = ep.Spec.Endpoint
logger.Infof("Calico CNI found existing endpoint: %v", endpoint)
break
}
}

```

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commit ID: 61de8217d21637a9b556193cc4ff7a2e746d78cf