net: do not duplicate connect and finish listners on destroySoon

Author: arturgawlik

lib/net.js

@@ -529,8 +529,9 @@ Socket.prototype._unrefTimer = function _unrefTimer() {
 // sent out to the other side.
 Socket.prototype._final = function(cb) {
   // If still connecting - defer handling `_final` until 'connect' will happen
-  if (this.connecting) {
+  if (this.connecting && !this._finalizingOnConnect) {
     debug('_final: not yet connected');
+    this._finalizingOnConnect = true;
     return this.once('connect', () => this._final(cb));
   }
 
@@ -800,8 +801,10 @@ Socket.prototype.destroySoon = function() {
 
   if (this.writableFinished)
     this.destroy();
-  else
+  else if (!this._destroyingOnFinish) {
+    this._destroyingOnFinish = true;
     this.once('finish', this.destroy);
+  }
 };