如何解决分配副本将锁定值复制到tr：net / http.Transport包含sync.Mutex

When I run go vet the following error is output:

client.go:2345: assignment copies lock value to tr: net/http.Transport contains sync.Mutex
exit status 1

client.go:2345:

var tr http.Transport

// Setup TLS
if clientConfig.TLSEnabled {
    tr = http.Transport{ // This is line 2345
        TLSClientConfig: &tls.Config{
            InsecureSkipVerify: true,
            MinVersion: tls.VersionTLS11,
        },
    }
}

How can I get around this warning? It's not stopping my builds; but, it's a warning and I don't want warnings.

You should be creating a *http.Transport pointer, instead of a value

tr = &http.Transport{