Function checkpointer

lib/lua/src/lgc.c:997–1000

** If pointer 'p' points to 'o', move it to the next element. */

** If pointer 'p' points to 'o', move it to the next element.
*/
static void checkpointer (GCObject **p, GCObject *o) {
  if (o == *p)
    *p = o->next;
}


/*