http: simplify Agent initialization

PR-URL: #33551
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Robert Nagy <ronagy@icloud.com>

lib/_http_agent.js

@@ -125,8 +125,8 @@ function Agent(options) {
       return;
     }
 
-    let freeSockets = this.freeSockets[name];
-    const freeLen = freeSockets ? freeSockets.length : 0;
+    const freeSockets = this.freeSockets[name] || [];
+    const freeLen = freeSockets.length;
     let count = freeLen;
     if (this.sockets[name])
       count += this.sockets[name].length;
@@ -138,7 +138,6 @@ function Agent(options) {
       return;
     }
 
-    freeSockets = freeSockets || [];
     this.freeSockets[name] = freeSockets;
     socket[async_id_symbol] = -1;
     socket._httpMessage = null;