fixed a crash caused by unitialized variable focusedWidget.

widget/src/mac/nsMacEventHandler.cpp

@@ -118,7 +118,7 @@ PRBool nsMacEventHandler::HandleMenuCommand(
   long         aMenuResult)
 {
 	// get the focused widget
-	nsWindow* focusedWidget;
+	nsWindow* focusedWidget = nsnull;
 	nsCOMPtr<nsToolkit> toolkit ( dont_AddRef((nsToolkit*)mTopLevelWidget->GetToolkit()) );
 	if (toolkit)
 		focusedWidget = toolkit->GetFocus();