GitLab

Add NULL callbacks for some things GSP calls that we don't handle, but know about
so we avoid the logging.

v2: Timur suggested allowing null fn.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231222043308.3090089-2-airlied@gmail.com