drm/tegra: drop unused variable.

Fixes: 0417d424 (drm/tegra: Stop cancelling page flip events)
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/tegra/drm.c

@@ -858,7 +858,6 @@ static void tegra_drm_preclose(struct drm_device *drm, struct drm_file *file)
 {
 	struct tegra_drm_file *fpriv = file->driver_priv;
 	struct tegra_drm_context *context, *tmp;
-	struct drm_crtc *crtc;
 
 	list_for_each_entry_safe(context, tmp, &fpriv->contexts, list)
 		tegra_drm_context_free(context);