drm/tegra: dc: Free syncpoint on errors

If an error happens during display controller initialization, the host1x
syncpoint previously requested would be leaked. Properly clean up the
syncpoint along with the other resources.

Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/dc.c

@@ -1925,6 +1925,8 @@ cleanup:
 		iommu_group_put(dc->group);
 	}
 
+	host1x_syncpt_free(dc->syncpt);
+
 	return err;
 }