FreeAttrCookie
status_t FreeAttrCookie(void* node, void* cookie);
status_t error = volume->FreeAttrCookie(fsNode->private_node, cookie);
result = volume->FreeAttrCookie(request->node, request->attrCookie);
virtual status_t FreeAttrCookie(void* node, void* cookie);
virtual status_t FreeAttrCookie(void* node, void* cookie);
virtual status_t FreeAttrCookie(void* node, void* cookie);
virtual status_t FreeAttrCookie(void* node, void* cookie);