- Patch #132789 by vdessel: fixed undefined variable.

modules/node/node.module

@@ -1646,9 +1646,8 @@ function node_revision_overview($node) {
     }
     $rows[] = array_merge($row, $operations);
   }
-  $output .= theme('table', $header, $rows);
 
-  return $output;
+  return theme('table', $header, $rows);
 }
 
 /**