Fixed a typo. According to the url pointed out by Royce3, it's right ( http://www.osronline.com/lists_archive/ntdev/thread1866.html)

svn path=/trunk/; revision=17258

reactos/ntoskrnl/ke/event.c

@@ -44,7 +44,7 @@ KeInitializeEvent(PKEVENT Event,
     /* Initialize the Dispatcher Header */
     KeInitializeDispatcherHeader(&Event->Header,
                                  Type,
-                                 sizeof(Event) / sizeof(ULONG),
+                                 sizeof(*Event) / sizeof(ULONG),
                                  State);
 }