per role not working in PLSQL

In the same spirit of this bug the code from

function session_limit_settings_byrole() {
  $result = db_query('SELECT name, value FROM {variable} WHERE name LIKE "session_limit_rid_%" ORDER BY name');

must be replaced with

  $result = db_query("SELECT name, value FROM {variable} WHERE name LIKE 'session_limit_rid_%' ORDER BY name");

same for

db_query('DELETE FROM {variable} WHERE name LIKE "session_limit_rid_%"');

Probably this applies to D7 too.