drm/exynos: modify goto labels to meaningful names

#ifdef CONFIG_DRM_EXYNOS_DP

	ret = platform_driver_register(&dp_driver);

	if (ret < 0)

		goto out_dp;

		return ret;

#endif

#ifdef CONFIG_DRM_EXYNOS_DSI

	ret = platform_driver_register(&dsi_driver);

	if (ret < 0)

		goto out_dsi;

		goto err_unregister_dp_drv;

#endif

#ifdef CONFIG_DRM_EXYNOS_FIMD

	ret = platform_driver_register(&fimd_driver);

	if (ret < 0)

		goto out_fimd;

		goto err_unregister_dsi_drv;

#endif

#ifdef CONFIG_DRM_EXYNOS_HDMI

	ret = platform_driver_register(&hdmi_driver);

	if (ret < 0)

		goto out_hdmi;

		goto err_unregister_fimd_drv;

	ret = platform_driver_register(&mixer_driver);

	if (ret < 0)

		goto out_mixer;

		goto err_unregister_hdmi_drv;

#endif

#ifdef CONFIG_DRM_EXYNOS_VIDI

	ret = platform_driver_register(&vidi_driver);

	if (ret < 0)

		goto out_vidi;

		goto err_unregister_mixer_drv;

#endif

#ifdef CONFIG_DRM_EXYNOS_G2D

	ret = platform_driver_register(&g2d_driver);

	if (ret < 0)

		goto out_g2d;

		goto err_unregister_vidi_drv;

#endif

#ifdef CONFIG_DRM_EXYNOS_FIMC

	ret = platform_driver_register(&fimc_driver);

	if (ret < 0)

		goto out_fimc;

		goto err_unregister_g2d_drv;

#endif

#ifdef CONFIG_DRM_EXYNOS_ROTATOR

	ret = platform_driver_register(&rotator_driver);

	if (ret < 0)

		goto out_rotator;

		goto err_unregister_fimc_drv;

#endif

#ifdef CONFIG_DRM_EXYNOS_GSC

	ret = platform_driver_register(&gsc_driver);

	if (ret < 0)

		goto out_gsc;

		goto err_unregister_rotator_drv;

#endif

#ifdef CONFIG_DRM_EXYNOS_IPP

	ret = platform_driver_register(&ipp_driver);

	if (ret < 0)

		goto out_ipp;

		goto err_unregister_gsc_drv;

	ret = exynos_platform_device_ipp_register();

	if (ret < 0)

		goto out_ipp_dev;

		goto err_unregister_ipp_drv;

#endif

	ret = platform_driver_register(&exynos_drm_platform_driver);

	if (ret < 0)

		goto out_drm;

		goto err_unregister_ipp_dev;

	exynos_drm_pdev = platform_device_register_simple("exynos-drm", -1,

				NULL, 0);

	if (IS_ERR(exynos_drm_pdev)) {

		ret = PTR_ERR(exynos_drm_pdev);

		goto out;

		goto err_unregister_drm_drv;

	}

	return 0;

out:

err_unregister_drm_drv:

	platform_driver_unregister(&exynos_drm_platform_driver);

out_drm:

err_unregister_ipp_dev:

#ifdef CONFIG_DRM_EXYNOS_IPP

	exynos_platform_device_ipp_unregister();

out_ipp_dev:

err_unregister_ipp_drv:

	platform_driver_unregister(&ipp_driver);

out_ipp:

err_unregister_gsc_drv:

#endif

#ifdef CONFIG_DRM_EXYNOS_GSC

	platform_driver_unregister(&gsc_driver);

out_gsc:

err_unregister_rotator_drv:

#endif

#ifdef CONFIG_DRM_EXYNOS_ROTATOR

	platform_driver_unregister(&rotator_driver);

out_rotator:

err_unregister_fimc_drv:

#endif

#ifdef CONFIG_DRM_EXYNOS_FIMC

	platform_driver_unregister(&fimc_driver);

out_fimc:

err_unregister_g2d_drv:

#endif

#ifdef CONFIG_DRM_EXYNOS_G2D

	platform_driver_unregister(&g2d_driver);

out_g2d:

err_unregister_vidi_drv:

#endif

#ifdef CONFIG_DRM_EXYNOS_VIDI

	platform_driver_unregister(&vidi_driver);

out_vidi:

err_unregister_mixer_drv:

#endif

#ifdef CONFIG_DRM_EXYNOS_HDMI

	platform_driver_unregister(&mixer_driver);

out_mixer:

err_unregister_hdmi_drv:

	platform_driver_unregister(&hdmi_driver);

out_hdmi:

err_unregister_fimd_drv:

#endif

#ifdef CONFIG_DRM_EXYNOS_FIMD

	platform_driver_unregister(&fimd_driver);

out_fimd:

err_unregister_dsi_drv:

#endif

#ifdef CONFIG_DRM_EXYNOS_DSI

	platform_driver_unregister(&dsi_driver);

out_dsi:

err_unregister_dp_drv:

#endif

#ifdef CONFIG_DRM_EXYNOS_DP

	platform_driver_unregister(&dp_driver);

out_dp:

#endif

	return ret;

}