net: emit close on unconnected socket

Socket should always emit 'close'. Regardless
whether it has been connected or not.
PR-URL: #29803
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Minwoo Jung <minwoo@nodesource.com>

Author: ronag

lib/net.js

@@ -660,10 +660,12 @@ Socket.prototype._destroy = function(exception, cb) {
 this._handle.onread=noop;
 this._handle=null;
 this._sockname=null;
+cb(exception);
+}else{
+cb(exception);
+process.nextTick(emitCloseNT,this);
 }
 
-cb(exception);
-
 if(this._server){
 debug('has server');
 this._server._connections--;

test/parallel/test-net-connect-destroy.js

@@ -0,0 +1,7 @@
+'use strict';
+constcommon=require('../common');
+constnet=require('net');
+
+constsocket=newnet.Socket();
+socket.on('close',common.mustCall());
+socket.destroy();