venus: subtract appended header size in vn_CreatePipelineCache
Use header->header_size to offset cache data as well in case the header struct extends on a newer driver but the cache data was appended with an old header. Fixes: 723f0bf7 ("venus: initial support for module and pipelines") Signed-off-by:Yiwei Zhang <zzyiwei@chromium.org> Reviewed-by:
Chia-I Wu <olvaffe@gmail.com> Part-of: <mesa/mesa!14463>