For lack of better error handling, shows that it might throw, mirrors `bindSync`.
```js
/**
 * Sync bind.
 *
 * @param {String} addr
 * @return {Socket} for chaining
 * @api public
 */

Socket.prototype.bindSync = function(addr) {
  try {
    this._zmq.bindSync(addr);
  } catch (err) {
    throw err;
  }

  return this;
};
```