drm/stm: Drop explicit drm_mode_config_cleanup call

It's right above the drm_dev_put().

This is made possible by a preceeding patch which added a drmm_
cleanup action to drm_mode_config_init(), hence all we need to do to
ensure that drm_mode_config_cleanup() is run on final drm_device
cleanup is check the new error code for _init().

Aside: Another driver with a bit much devm_kzalloc, which should
probably use drmm_kzalloc instead ...

v2: Explain why this cleanup is possible (Laurent).

v3: Use drmm_mode_config_init() for more clarity (Sam, Thomas)

Cc: Sam Ravnborg <[e-mail]>
Cc: Thomas Zimmermann <[e-mail]>
Acked-by: Sam Ravnborg <[e-mail]>
Acked-by: Philippe Cornu <[e-mail]>
Cc: Laurent Pinchart <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>
Cc: Yannick Fertre <[e-mail]>
Cc: Philippe Cornu <[e-mail]>
Cc: Benjamin Gaignard <[e-mail]>
Cc: Vincent Abriou <[e-mail]>
Cc: Maxime Coquelin <[e-mail]>
Cc: Alexandre Torgue <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/stm/drv.c

···
 
 	ddev->dev_private = (void *)ldev;
 
-	drm_mode_config_init(ddev);
+	ret = drmm_mode_config_init(ddev);
+	if (ret)
+		return ret;
 
 	/*
 	 * set max width and height as default value.
···
 
 	ret = ltdc_load(ddev);
 	if (ret)
-		goto err;
+		return ret;
 
 	drm_mode_config_reset(ddev);
 	drm_kms_helper_poll_init(ddev);
···
 	platform_set_drvdata(pdev, ddev);
 
 	return 0;
-err:
-	drm_mode_config_cleanup(ddev);
-	return ret;
 }
 
 static void drv_unload(struct drm_device *ddev)
···
 
 	drm_kms_helper_poll_fini(ddev);
 	ltdc_unload(ddev);
-	drm_mode_config_cleanup(ddev);
 }
 
 static __maybe_unused int drv_suspend(struct device *dev)