lib: remove useless cwd in posix.resolve

PR-URL: #23902
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/path.js

@@ -1156,16 +1156,13 @@ const posix = {
   resolve: function resolve() {
     var resolvedPath = '';
     var resolvedAbsolute = false;
-    var cwd;
 
     for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
       var path;
       if (i >= 0)
         path = arguments[i];
       else {
-        if (cwd === undefined)
-          cwd = process.cwd();
-        path = cwd;
+        path = process.cwd();
       }
 
       assertPath(path);