drm/exynos: use helpers

	struct drm_device *dev = connector->dev;

	struct exynos_drm_connector *exynos_connector =

					to_exynos_connector(connector);

	struct drm_mode_object *obj;

	struct drm_encoder *encoder;

	obj = drm_mode_object_find(dev, exynos_connector->encoder_id,

				   DRM_MODE_OBJECT_ENCODER);

	if (!obj) {

		DRM_DEBUG_KMS("Unknown ENCODER ID %d\n",

				exynos_connector->encoder_id);

		return NULL;

	}

	encoder = obj_to_encoder(obj);

	return encoder;

	return drm_encoder_find(dev, exynos_connector->encoder_id);

}

static struct drm_connector_helper_funcs exynos_connector_helper_funcs = {