[HttpFoundation] tweaked previous merge

src/Symfony/Component/HttpFoundation/Response.php

@@ -300,7 +300,11 @@ class Response
         if (function_exists('fastcgi_finish_request')) {
             fastcgi_finish_request();
         } else {
-            while (0 < ob_get_level()) {
+            // ob_get_level() never returns 0 on some Windows configurations, so if
+            // the level is the same two times in a row, the loop should be stopped.
+            $previous = null;
+            while (($level = ob_get_level()) > 0 && $level !== $previous) {
+                $previous = $level;
                 ob_end_flush();
             }
             flush();