[NTOS:CM] Do not acquire a KCB lock twice when deleting a key object

This prevents a deadlock in DelistKeyBodyFromKCB when we delete a key
object because of an access check failure during a open procedure of a
registry key, as we are already holding a lock against the target KCB of
the key body.

ntoskrnl/config/cmsysini.c

@@ -138,7 +138,7 @@ CmpDeleteKeyObject(PVOID DeletedObject)
         if (Kcb)
         {
             /* Delist the key */
-            DelistKeyBodyFromKCB(KeyBody, FALSE);
+            DelistKeyBodyFromKCB(KeyBody, KeyBody->KcbLocked);
 
             /* Dereference the KCB */
             CmpDelayDerefKeyControlBlock(Kcb);