[PATCH v4] iommu/riscv: prevent NULL deref in iova_to_phys

[Markus Elfring]

…> ---
> Changes
> v4:
> - Change the summary as Markus recommends
> 
> v3:
> - Remove redundant pte validation in riscv_iommu_iova_to_phys
> - Improve subject line to emphasize prevention
…

Does anything hinder you to integrate repeated patch review ideas better
into your contributions?

Repetition:
https://lore.kernel.org/lkml/effb29be-6d14-47e5-ab71-454119467750@web.de/
https://lkml.org/lkml/2025/8/7/282

Regards,
Markus