Fixing user ID to be single valued when hashing in consent module

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@404 44740490-163a-0410-bde0-09ae8108e29a

lib/SimpleSAML/Consent/Consent.php

@@ -80,7 +80,7 @@ class SimpleSAML_Consent_Consent {
 				$userid_attributename . '] was not available.');
 		}
 		
-		$userid = $this->attributes[$userid_attributename];
+		$userid = $this->attributes[$userid_attributename][0];
 		
 		return hash('sha1', $userid . $this->salt . $this->getIdPID() );
 	}