to #26323588

commit 86a761f81ec87a96572214f5db606f60d36aaf08 upstream.

REQ_F_FORCE_ASYNC is checked only for the head of a link. Fix it.
Signed-off-by: NPavel Begunkov <asml.silence@gmail.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>
Signed-off-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Acked-by: NXiaoguang Wang <xiaoguang.wang@linux.alibaba.com>