firewire: in-code doc updates.

 * This function builds the tree representation of the topology given

 * by the self IDs from the latest bus reset.  During the construction

 * of the tree, the function checks that the self IDs are valid and

 * internally consistent.  On succcess this funtions returns the

 * internally consistent.  On succcess this function returns the

 * fw_node corresponding to the local card otherwise NULL.

 */

static struct fw_node *build_tree(struct fw_card *card,

		 */

		for (i = 0, h = &stack; i < child_port_count; i++)

			h = h->prev;

		/*

		 * When the stack is empty, this yields an invalid value,

		 * but that pointer will never be dereferenced.

		 */

		child = fw_node(h);

		node = fw_node_create(q, port_count, card->color);