Another syntax fix

Murphy hit me in the face

lib/_autoload.php

@@ -10,12 +10,12 @@
 
 // SSP is loaded as a separate project
 $libpath = \SimpleSAML\Utils\System::resolvePath(dirname(dirname(__FILE__)).'/vendor/autoload.php');
-if (file_exists($libpath) {
-    require_once $libpath;
+if (file_exists($libpath)) {
+    require_once($libpath);
 } else {  // SSP is loaded as a library
     $libpath = \SimpleSAML\Utils\System::resolvePath(dirname(dirname(__FILE__)).'/../../autoload.php');
-    if (file_exists($libpath) {
-        require_once $libpath;
+    if (file_exists($libpath)) {
+        require_once($libpath);
     } else {
         throw new Exception('Unable to load Composer autoloader');
     }