drm/modes: drop __drm_framebuffer_unregister.

Just use the generic function.

The main side effect of this is that the fb->base.id
is now protected by the idr mutex as well.
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_crtc.c

@@ -389,15 +389,6 @@ struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
 }
 EXPORT_SYMBOL(drm_mode_object_find);
 
-/* dev->mode_config.fb_lock must be held! */
-static void __drm_framebuffer_unregister(struct drm_device *dev,
-					 struct drm_framebuffer *fb)
-{
-	drm_mode_object_put(dev, &fb->base);
-
-	fb->base.id = 0;
-}
-
 static void drm_framebuffer_free(struct kref *kref)
 {
 	struct drm_framebuffer *fb =
@@ -409,10 +400,7 @@ static void drm_framebuffer_free(struct kref *kref)
 	 * removed at this point. Check for that.
 	 */
 	mutex_lock(&dev->mode_config.fb_lock);
-	if (fb->base.id) {
-		/* Mark fb as reaped and drop idr ref. */
-		__drm_framebuffer_unregister(dev, fb);
-	}
+	drm_mode_object_unregister(dev, &fb->base);
 	mutex_unlock(&dev->mode_config.fb_lock);
 
 	fb->funcs->destroy(fb);
@@ -549,7 +537,7 @@ void drm_framebuffer_unregister_private(struct drm_framebuffer *fb)
 
 	mutex_lock(&dev->mode_config.fb_lock);
 	/* Mark fb as reaped and drop idr ref. */
-	__drm_framebuffer_unregister(dev, fb);
+	drm_mode_object_unregister(dev, &fb->base);
 	mutex_unlock(&dev->mode_config.fb_lock);
 }
 EXPORT_SYMBOL(drm_framebuffer_unregister_private);