Remove extra space

Author: RoSk0

lib/Auth/Source/External.php

@@ -318,7 +318,7 @@ private function getUser() {
 	 * @param array &$state  Information about the current authentication.
 	 */
 	public function authenticate(&$state) {
-		assert(is_array($state) );
+		assert(is_array($state));
 
 		$attributes = $this->getUser();
 		if ($attributes !== NULL) {