NAME
	RemHead -- remove the head node from a list

   SYNOPSIS
	node = RemHead(list)
	D0	       A0

	struct Node *RemHead(struct List *);

   FUNCTION
	Get a pointer to the head node and remove it from the list.
	Assembly programmers may prefer to use the REMHEAD macro from
	"exec/lists.i".

   WARNING
	This function does not arbitrate for access to the list.  The
	calling task must be the owner of the involved list.

   INPUTS
	list - a pointer to the target list header

   RESULT
	node - the node removed or zero when empty list

   SEE ALSO
	AddHead(), AddTail(), Enqueue(), Insert(), Remove(), RemTail()