saml: Fix new logout when using memcache datastore.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@2611 44740490-163a-0410-bde0-09ae8108e29a

modules/saml/lib/SP/LogoutStore.php

@@ -137,7 +137,7 @@ class sspmod_saml_SP_LogoutStore {
 
 		$res = array();
 		foreach ($sessionIndexes as $sessionIndex) {
-			$sessionId = $store->get('saml.LogoutStore', $strNameId . ':' . $sessionIndex);
+			$sessionId = $store->get('saml.LogoutStore', $nameId . ':' . $sessionIndex);
 			if ($sessionId === NULL) {
 				continue;
 			}