Index: modules/system/system.api.php
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.api.php,v
retrieving revision 1.229
diff -u -p -r1.229 system.api.php
--- modules/system/system.api.php	19 Feb 2011 00:09:11 -0000	1.229
+++ modules/system/system.api.php	20 Feb 2011 22:45:57 -0000
@@ -2552,7 +2552,7 @@ function hook_file_load($files) {
  *
  * @see file_validate()
  */
-function hook_file_validate(&$file) {
+function hook_file_validate($file) {
   $errors = array();
 
   if (empty($file->filename)) {