TLS客户端服务器的证书链验证，无需服务器名验证

Is it possible to do server's certificate chain verification without verifying servername in Go TLS client from crypto/tls package?

As shown in the below code snippet, if we don't provide any servername we get error like

tls: either ServerName or InsecureSkipVerify must be specified in the tls.Config

rootCA := x509.NewCertPool()
caCert, _ := ioutil.ReadFile("/path/to/ca_cert.pem")
rootCA.AppendCertsFromPEM(caCert)

tlsConfig = tls.Config{
    RootCAs:    rootCA,
    ServerName: "xyz.com",
}

conn, _ := net.Dial("tcp", "ip:port")

c := tls.Client(conn, &tlsConfig)
c.Handshake()

I have a requirement where only server's certificate chain verification is required and servername verification not needed but with Go's crypto/tls package both verification is coupled as an unit.