NAME
        AddFreeList - add memory to a free list.

   SYNOPSIS
        status = AddFreeList(free, mem, len)
          D0                  A0    A1   A2

        bool addfreelist(struct freelist *, aptr, ulong);

   FUNCTION
        This routine adds the specified memory to the free list.
        The free list will be extended (if required).  If there
        is not enough memory to complete the call, NULL is returned.

        Note that AddFreeList() does NOT allocate the requested memory.
        It only records the memory in the free list.

   INPUTS
        free -- a pointer to a freelist structure
        mem -- the base of the memory to be recorded
        len -- the length of the memory to be recorded

   RESULTS
        status -- TRUE if the call succeeded else FALSE;

   SEE ALSO
        exec.library/allocentry
        exec.library/freeentry
        icon.library/freefreelist
        workbench/workbench.h