io_uring: use lockless_cq flag in io_req_complete_post()

io_uring_create() computes ctx->lockless_cq as:
ctx->task_complete || (ctx->flags & IORING_SETUP_IOPOLL)

So use it to simplify that expression in io_req_complete_post().

Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Reviewed-by: Li Zetao <lizetao1@huawei.com>
Link: https://lore.kernel.org/r/20250212005119.3433005-1-csander@purestorage.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: calebsander

io_uring/io_uring.c

@@ -900,7 +900,7 @@ static void io_req_complete_post(struct io_kiocb *req, unsigned issue_flags)
 	 * Handle special CQ sync cases via task_work. DEFER_TASKRUN requires
 	 * the submitter task context, IOPOLL protects with uring_lock.
 	 */
-	if (ctx->task_complete || (ctx->flags & IORING_SETUP_IOPOLL)) {
+	if (ctx->lockless_cq) {
 		req->io_task_work.func = io_req_task_complete;
 		io_req_task_work_add(req);
 		return;