kselftest: arm64: Add a null pointer check

[Markus Elfring]

> > There is a 'malloc' call, which can be unsuccessful.
> > This patch will add the malloc failure checking
> > to avoid possible null dereference and give more information
> > about test fail reasons.
>
> Applied to arm64 (for-next/selftests), thanks!
>
> [1/1] kselftest: arm64: Add a null pointer check
>       https://git.kernel.org/arm64/c/80164282b362

Why did you not adhere to known requirements for such a change description?
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.9-rc5#n94

* Imperative mood

* Addition of the tag “Fixes”


Regards,
Markus