vkr: fix two more cases of NULL dereferences

These are marked noautovalidity="true" in vk.xml and the decoder does
not validate them.  There are more incidents, but for the others, we
will let VVL do its job.  Reported by Yiwei.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org>
Reviewed-by: Ryan Neph <ryanneph@google.com>
2 files changed