[NFC] Remove extraneous NULL

It confuses code analysers & Coleman says it's silly

diff --git a/CRM/Core/Config.php b/CRM/Core/Config.php
index 415762ce4afbd2aeb9d4bf23819626178ceffe73..2aa80a0cfe1473424b653cb59cc4dcfb916c35ec 100644 (file)
--- a/CRM/Core/Config.php
+++ b/CRM/Core/Config.php
@@ -66,7 +66,7 @@ class CRM_Core_Config extends CRM_Core_Config_MagicMerge {
    *
    * @var CRM_Core_Config
    */
-  private static $_singleton = NULL;
+  private static $_singleton;
 
   /**
    * Singleton function used to manage this object.