saml2_Message: Fix generation of NameID based on attributes.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@1691 44740490-163a-0410-bde0-09ae8108e29a

modules/saml2/lib/Message.php

@@ -433,7 +433,7 @@ class sspmod_saml2_Message {
 			return SimpleSAML_Utilities::generateID();
 		}
 
-		$value = $attributes[$attribute][0];
+		return $attributes[$attribute][0];
 	}