io_uring/poll: remove outdated comments of caching

Previous commit 13a99017 ("io_uring: remove events caching
atavisms") entirely removes the events caching optimization introduced
by commit 81459350 ("io_uring: cache req->apoll->events in
req->cflags"). Hence the related comment should also be removed to avoid
misunderstanding.

Fixes: 13a99017 ("io_uring: remove events caching atavisms")
Signed-off-by: Lin Ma <linma@zju.edu.cn>
Link: https://lore.kernel.org/r/20221110060313.16303-1-linma@zju.edu.cnSigned-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/poll.c

@@ -324,12 +324,7 @@ static void io_apoll_task_func(struct io_kiocb *req, bool *locked)
 static void __io_poll_execute(struct io_kiocb *req, int mask)
 {
 	io_req_set_res(req, mask, 0);
-	/*
-	 * This is useful for poll that is armed on behalf of another
-	 * request, and where the wakeup path could be on a different
-	 * CPU. We want to avoid pulling in req->apoll->events for that
-	 * case.
-	 */
+
 	if (req->opcode == IORING_OP_POLL_ADD)
 		req->io_task_work.func = io_poll_task_func;
 	else