bugfix: Fix instancing NoPassive errors in the IdP

The NoPassive constructor requirest the first parameter to be a constant indicating whether the error is due to the requester or the responder. Therefore, passing only an error message is not a valid way to create a NoPassive object anymore.

lib/SimpleSAML/IdP.php

@@ -2,6 +2,8 @@
 
 namespace SimpleSAML;
 
+use SAML2\Constants as SAML2;
+
 use SimpleSAML\Auth;
 use SimpleSAML\Error;
 use SimpleSAML\Metadata\MetaDataStorageHandler;
@@ -353,7 +355,7 @@ class IdP
     private function authenticate(array &$state)
     {
         if (isset($state['isPassive']) && (bool) $state['isPassive']) {
-            throw new NoPassive('Passive authentication not supported.');
+            throw new NoPassive(SAML2::STATUS_RESPONDER, 'Passive authentication not supported.');
         }
 
         $this->authSource->login($state);