Remove unused variable

The assignment to $stateID is dead and can be removed.

modules/authfacebook/lib/Auth/Source/Facebook.php

@@ -86,7 +86,7 @@ class sspmod_authfacebook_Auth_Source_Facebook extends SimpleSAML_Auth_Source {
 
 		// We are going to need the authId in order to retrieve this authentication source later
 		$state[self::AUTHID] = $this->authId;
-		$stateID = SimpleSAML_Auth_State::saveState($state, self::STAGE_INIT);
+		SimpleSAML_Auth_State::saveState($state, self::STAGE_INIT);
 		
 		$facebook = new sspmod_authfacebook_Facebook(array('appId' => $this->api_key, 'secret' => $this->secret), $state);
 		$facebook->destroySession();