Refactor the patch to limit its scope to bind actions

This way, other tests keep passing

lib/client/client.js

@@ -120,10 +120,6 @@ function Client (options) {
 
   this.log = options.log.child({ clazz: 'Client' }, true)
 
-  this.on('error', function (err) {
-    self.cb(err)
-  })
-
   this.timeout = parseInt((options.timeout || 0), 10)
   this.connectTimeout = parseInt((options.connectTimeout || 0), 10)
   this.idleTimeout = parseInt((options.idleTimeout || 0), 10)
@@ -172,18 +168,6 @@ function Client (options) {
 util.inherits(Client, EventEmitter)
 module.exports = Client
 
-/**
- * Default handler for error callbacks when
- * one isn't set in the instance
- */
-Client.prototype.cb = function (err, ret) {
-  if (err) {
-    this.log.error('Caught exception:', err)
-  } else {
-    this.log.info('Unhandled output:', ret)
-  }
-}
-
 /**
  * Sends an abandon request to the LDAP server.
  *
@@ -298,13 +282,15 @@ Client.prototype.bind = function bind (name,
     controls: controls
   })
 
+  // While we are binding to the server, register the callback as error handler
   var self = this
-  this.cb = function (err, ret) {
-    delete self.cb
+  function callbackWrapper (err, ret) {
+    self.removeListener('error', callbackWrapper)
     callback(err, ret)
   }
+  this.addListener('error', callbackWrapper)
 
-  return this._send(req, [errors.LDAP_SUCCESS], null, callback, _bypass)
+  return this._send(req, [errors.LDAP_SUCCESS], null, callbackWrapper, _bypass)
 }
 
 /**