[PATCH] mailmap: update Khadem Ullah email address

[Stephen Hemminger]

On Mon, 27 Jul 2026 11:28:20 +0500
Khadem Ullah <khadem.systems at gmail.com> wrote:

> -Khadem Ullah <14pwcse1224 at uetpeshawar.edu.pk>
> +Khadem Ullah <khadem.systems at gmail.com> <14pwcse1224 at uetpeshawar.edu.pk>
> +Khadem Ullah <khadem.systems at gmail.com> khadem <14pwcse1224 at uetpeshawar.edu.pk>

That doesn't look the right format, need to drop the "khadem" there.