stream = kcalloc(1, sizeof *stream, mem_flags);
stream = kzalloc(sizeof *stream, mem_flags);
iso_stream_alloc (unsigned mem_flags){	struct ehci_iso_stream *stream;	stream = kcalloc(1, sizeof *stream, mem_flags);	if (likely (stream != NULL)) {		INIT_LIST_HEAD(&stream->td_list);		INIT_LIST_HEAD(&stream->free_list);		stream->next_uframe = -1;		stream->refcount = 1;	}	return stream;}