Sum a Linked List
You are given a linked list node at addr HEAD.
Each list node consists of a word next that points to
the next node in the list, followed by a word value. The last
node in the list has its next pointer set to 0 (NULL).
You can think of each node as being equivalent to the following C struct:
struct node {
struct node *next;
int value;
};Your task is to find the sum of all the
values in the list,
and write this sum to SUM,
then call the break instruction