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Kaspar Schleiser
88b509e56d
ztimer's machinery depends on figuring out if a timer is currently set or not. It does that using _is_set(), which is also exposed as ztimer_is_set(). Now when a timer expired and got taken of the timer queue using _now_next(), the `next` pointer wasn't unset. This caused _is_set() to wrongly return `true` for that timer. Internally in ztimer, this didn't cause breakage, just an unnecessary iteration of the timer queue by _delete_timer_from_list(). But this also broke the public ztimer_is_set(). This commit fixes the issue by correctly NULLing the timer's `next` pointer when the timer triggers.