fixing mac build bustage

widget/src/mac/nsWindow.cpp

@@ -651,13 +651,16 @@ NS_IMETHODIMP	nsWindow::Update()
 			nsIEnumerator* children = GetChildren();
       if (children)
 			{
-				children->Reset();
-				nsWindow* child = (nsWindow*)children->Next();
-				while (child)
+        nsWindow* child;
+				children->First();
+				do
 				{
+          if (NS_SUCCEEDED(children->CurrentItem(&child)))  {
 					  child->Update();
 					  child = (nsWindow*)children->Next();
           }
+				}
+        while (NS_SUCCEEDED(children->Next()));			
 				delete children;
 			}
 			NS_RELEASE(renderingContext);		// this restores the origin to (0, 0)
@@ -949,9 +952,11 @@ nsWindow*  nsWindow::FindWidgetHit(Point aThePoint)
 		nsIEnumerator* children = GetChildren();
 		if (children)
 		{
-			children->Reset();
-			nsWindow* child = (nsWindow*)children->Next();
-			while (child)
+			children->First();
+			nsWindow* child;
+			do
+			{
+        if (NS_SUCCEEDED(children->CurrentItem(&child))
         {
 				  nsWindow* deeperHit = child->FindWidgetHit(aThePoint);
 				  if (deeperHit)
@@ -962,6 +967,8 @@ nsWindow*  nsWindow::FindWidgetHit(Point aThePoint)
 				  else
 					  child = (nsWindow*)children->Next();
         }
+			}
+      while (NS_SUCCEEDED(children->Next()));
 			delete children;
 		}
 	}