CVE-2025-21843 drm/panthor: avoid garbage value in panthor_ioctl_dev_query()

In the Linux kernel, the following vulnerability has been resolved: drm/panthor: avoid garbage value in panthorioctldevquery 'prioritiesinfo' is uninitialized, and the uninitialized value is copied to user object when calling PANTHORUOBJSET. Using memset to initialize 'prioritiesinfo' to avoid th...