Fix Promise.wait() for fired promises

Failure introduced in 80ace36e4c

src/node.js

@@ -297,6 +297,18 @@ var eventsModule = createInternalModule('events', function (exports) {
     var ret;
     var hadError = false;
 
+    if (this.hasFired) {
+      ret = (this._values.length == 1)
+          ? this._values[0]
+          : this.values;
+
+      if (this.hasFired == 'success') {
+        return ret;
+      } else if (this.hasFired == 'error') {
+        throw ret;
+      }
+    }
+
     self.addCallback(function () {
       if (arguments.length == 1) {
         ret = arguments[0];