core_Auth_Process_TargetedID: Save NameID as a string.

This works around PHP not being able to serialize() DOM nodes.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@1701 44740490-163a-0410-bde0-09ae8108e29a

modules/core/lib/Auth/Process/TargetedID.php

@@ -142,7 +142,7 @@ class sspmod_core_Auth_Process_TargetedID extends SimpleSAML_Auth_ProcessingFilt
 			$doc->appendChild($root);
 
 			SAML2_Utils::addNameId($root, $nameId);
-			$uid = $root->childNodes;
+			$uid = $doc->saveXML($root->firstChild);
 		}
 
 		$state['Attributes']['eduPersonTargetedID'] = array($uid);