kernel/util: Add static assert that the two list links are the same size.

They are used interchangeably in some places, so we should assert this.

src/system/kernel/util/list.cpp

@@ -5,6 +5,7 @@
 
 
 #include <util/list.h>
+#include <util/DoublyLinkedList.h>
 #include <BytePointer.h>
 
 
@@ -13,6 +14,9 @@
 #define GET_LINK(list, item) ({ BytePointer<list_link> pointer((uint8*)item \
 	+ list->offset); &pointer; })
 
+STATIC_ASSERT(sizeof(DoublyLinkedListLink<void*>) == sizeof(list_link));
+
+
 /** Initializes the list with a specified offset to the link
  *	structure in the items that will be part of the list.
  */