When we want to pass sub contexts directly to the function to avoid
having to de-reference the context pointer all the time there are rare
cases when we need the pointer to the parent context (e.g. for error
reporting). For these cases we need to be able to get the parent context.
Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
Gert Wollny