drm/writeback: don't set fence->ops to default

It's the default.
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200511091142.208787-1-daniel.vetter@ffwll.ch

drivers/gpu/drm/drm_writeback.c

@@ -108,7 +108,6 @@ static const struct dma_fence_ops drm_writeback_fence_ops = {
 	.get_driver_name = drm_writeback_fence_get_driver_name,
 	.get_timeline_name = drm_writeback_fence_get_timeline_name,
 	.enable_signaling = drm_writeback_fence_enable_signaling,
-	.wait = dma_fence_default_wait,
 };
 
 static int create_writeback_properties(struct drm_device *dev)