Fixed upgrade script for single link fields. Issue #132440. Thanks budda!

link.install

@@ -33,13 +33,13 @@ function link_update_1() {
           $ret[] = update_sql('INSERT INTO {'. $db_info['table'] .'} (vid, delta, nid, '. $field['field_name'] .'_url, '. $field['field_name'] .'_title, '. $field['field_name'] ."_attributes) SELECT vid, delta, nid, field_url, field_title, attributes FROM {node_field_link_data} WHERE field_name = '". $field['field_name'] ."'");
         }
         else {
-          $ret[] = update_sql('INSERT INTO {'. $db_info['table'] .'} (vid, nid, '. $field['field_name'] .'_url, '. $field['field_name'] .'_title, '. $field['field_name'] ."_attributes) SELECT vid, nid, field_url, field_title, attributes FROM {node_field_link_data} WHERE field_name = '". $field['field_name'] ."'");
+          $ret[] = update_sql('UPDATE {'. $db_info['table'] .'} c, {node_field_link_data} l SET c.'. $field['field_name'] .'_url = l.field_url, c.'. $field['field_name'] .'_title = l.field_title, c.'. $field['field_name'] ."_attributes = l.attributes WHERE l.field_name = '". $field['field_name'] ."' AND c.vid = l.vid AND c.nid = l.nid");
         }
     }
   }
 
   $ret[] = update_sql('DROP TABLE {node_field_link_data}');
-  
+
   db_query('DELETE FROM {cache}');
   return $ret;
 }