[ZF-9871] Zend_Validate:

- changed behaviour for validating multifiles

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@22398 44c647ce-9c0f-0410-b52a-842ac1e357ba

library/Zend/Validate/File/Upload.php

@@ -156,6 +156,7 @@ class Zend_Validate_File_Upload extends Zend_Validate_Abstract
      */
     public function isValid($value, $file = null)
     {
+        $this->_messages = null;
         if (array_key_exists($value, $this->_files)) {
             $files[$value] = $this->_files[$value];
         } else {