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Index: drupal/modules/system/system.admin.inc
--- drupal/modules/system/system.admin.inc Base (1.318)
+++ drupal/modules/system/system.admin.inc Locally Modified (Based On 1.318)
@@ -1346,7 +1346,6 @@
  *   use as the default value of the IP address form field.
  */
 function system_ip_blocking($default_ip = '') {
-  $output = '';
   $rows = array();
   $header = array(t('Blocked IP addresses'), t('Operations'));
   $result = db_query('SELECT * FROM {blocked_ips}');