Fix the limit check. If the limit is less than the compare value,
the timer can never reach this value, thus it will never fire.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1491


Signed-off-by: Axel Heider <axel.heider@hensoldt.net>
Message-id: 168070611775.20412.2883242077302841473-2@git.sr.ht
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>