message: Fix unmount TypeError in `DeviceVerifyButtons`
diff: @@ -42,7 +42,9 @@ export default React.createClass({
  componentWillUnmount: function() {
  const cli = MatrixClientPeg.get();
  + if (cli) {
  cli.removeListener("deviceVerificationChanged", this.onDeviceVerificationChanged);
  + }
  },
  onDeviceVerificationChanged: function(userId, deviceId, deviceInfo) {
  