Remove unused variable.

It is set later inside one of the branches of the if, but the other branches abort the execution of the method, so there's no need to define it outside the if.

lib/SimpleSAML/Configuration.php

@@ -115,7 +115,6 @@ class SimpleSAML_Configuration
             return self::$loadedConfigs[$filename];
         }
 
-        $spurious_output = false;
         if (file_exists($filename)) {
             $config = 'UNINITIALIZED';