_NG_HOOK_NODE
return (_NG_HOOK_NODE(hook));
#define NG_HOOK_NODE(hook) _NG_HOOK_NODE(hook)
if (_NG_HOOK_NODE(hook)) /* it'll probably be ng_deadnode */
_NG_NODE_UNREF((_NG_HOOK_NODE(hook)));
_NG_HOOK_NODE(hook) = &ng_deadnode;