kubernetes-sigs/cloud-provider-huaweicloud: pkg/cloudprovider/huaweicloud/nat.go; 18 LoC

Found a possible issue in [kubernetes-sigs/cloud-provider-huaweicloud](https://www.github.com/kubernetes-sigs/cloud-provider-huaweicloud) at [pkg/cloudprovider/huaweicloud/nat.go](https://github.com/kubernetes-sigs/cloud-provider-huaweicloud/blob/7b720b6aaad577fb8d5daace8f220152f979cff8/pkg/cloudprovider/huaweicloud/nat.go#L210-L227)

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.

> function call which takes a reference to dnatRule at line 215 may start a goroutine

[Click here to see the code in its original context.](https://github.com/kubernetes-sigs/cloud-provider-huaweicloud/blob/7b720b6aaad577fb8d5daace8f220152f979cff8/pkg/cloudprovider/huaweicloud/nat.go#L210-L227)

Click here to show the 18 line(s) of Go which triggered the analyzer.

```go
for _, dnatRule := range dnatRuleList.DNATRules {
if dnatRule.FloatingIpAddress != service.Spec.LoadBalancerIP {
continue
}

if nat.getServicePort(&dnatRule, lbPorts) != nil {
klog.V(4).Infoln("port exist,no need to delete")
continue
}

klog.V(4).Infof("rule:%v port not exist,start delete dnat rule", dnatRule)

err := nat.ensureDeleteDNATRule(natProvider, &dnatRule)
if err != nil {
errs = append(errs, fmt.Errorf("EnsureDeleteDNATRule Failed: %v", err))
continue
}
}

```

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commit ID: 7b720b6aaad577fb8d5daace8f220152f979cff8