[LTP] aio_cancel: Fix incorrect strerror() usage

[linuxtestproject.agent@gmail.com]

Hi Martin,

--- [PATCH 1/2] ---

On 2026-04-28, Martin Doucha wrote:
> aio_cancel: Fix incorrect strerror() usage

This is fixing a real bug but both patches in this series are missing
Fixes: tags.

--- [PATCH 2/2] ---

On 2026-04-28, Martin Doucha wrote:
> aio_cancel_6-1: Rewrite test

> +	if (gret != AIO_CANCELED) {
> +		printf(TNAME " Unexpected aio_cancel() return value: %s\n",
> +			strerror(gret));

strerror() expects an errno value; AIO_CANCELED, AIO_NOTCANCELED, and
AIO_ALLDONE are not errno values (they are 0, 1, 2 on Linux, mapping to
"Success", "Operation not permitted", "No such file or directory").
Use "%d" to print the raw integer instead.

Pre-existing issues noticed in the surrounding code (not introduced
by this patch):

- 5-1.c:70, 7-1.c:56 — nanosleep() used for synchronization in a
  polling loop (sleep-based sync).

---
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