[PATCH v2] io_uring: fix incorrect unlikely() usage in io_waitid_prep()

[Alok Tiwari <alok.a.tiwari@oracle.com>]

The negation operator incorrectly places outside the unlikely() macro:

    if (!unlikely(iwa))

This inverted the compiler branch prediction hint, marking the NULL
case as likely instead of unlikely. The intent is to indicate that
allocation failures are rare, consistent with common kernel patterns.

 Moving the negation inside unlikely():

    if (unlikely(!iwa))

Fixes: 2b4fc4cd43f2 ("io_uring/waitid: setup async data in the prep handler")
Signed-off-by: Alok Tiwari <alok.a.tiwari@oracle.com>
---
v1 -> v2
Remove misleading "constant result" wording and
rephrase commit message
--
 io_uring/waitid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/io_uring/waitid.c b/io_uring/waitid.c
index f25110fb1b12..53532ae6256c 100644
--- a/io_uring/waitid.c
+++ b/io_uring/waitid.c
@@ -250,7 +250,7 @@ int io_waitid_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 		return -EINVAL;
 
 	iwa = io_uring_alloc_async_data(NULL, req);
-	if (!unlikely(iwa))
+	if (unlikely(!iwa))
 		return -ENOMEM;
 	iwa->req = req;
 
-- 
2.50.1