Just do what everybody else but Nouveau does and return 0.0f.
This prevents the repeated logging of these messages on startup:
Unexpected PIPE_CAPF 6 query Unexpected PIPE_CAPF 7 query Unexpected PIPE_CAPF 8 query
1b97d9c1800 panfrost: Add CAPFs for conservative rasterization
src/gallium/drivers/panfrost/pan_screen.c | 5 +++++
1 file changed, 5 insertions(+)