drm/arm/hdlcd: plane: use drm managed resources

Use drm managed resource allocation (drmm_universal_plane_alloc()) in
order to get rid of the explicit destroy hook in struct drm_plane_funcs.

Signed-off-by: Danilo Krummrich <[e-mail]>
Signed-off-by: Liviu Dudau <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/arm/hdlcd_crtc.c

···
 static const struct drm_plane_funcs hdlcd_plane_funcs = {
 	.update_plane		= drm_atomic_helper_update_plane,
 	.disable_plane		= drm_atomic_helper_disable_plane,
-	.destroy		= drm_plane_cleanup,
 	.reset			= drm_atomic_helper_plane_reset,
 	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
 	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
···
 	struct hdlcd_drm_private *hdlcd = drm_to_hdlcd_priv(drm);
 	struct drm_plane *plane = NULL;
 	u32 formats[ARRAY_SIZE(supported_formats)], i;
-	int ret;
-
-	plane = devm_kzalloc(drm->dev, sizeof(*plane), GFP_KERNEL);
-	if (!plane)
-		return ERR_PTR(-ENOMEM);
 
 	for (i = 0; i < ARRAY_SIZE(supported_formats); i++)
 		formats[i] = supported_formats[i].fourcc;
 
-	ret = drm_universal_plane_init(drm, plane, 0xff, &hdlcd_plane_funcs,
-				       formats, ARRAY_SIZE(formats),
-				       NULL,
-				       DRM_PLANE_TYPE_PRIMARY, NULL);
-	if (ret)
-		return ERR_PTR(ret);
+	plane = drmm_universal_plane_alloc(drm, struct drm_plane, dev, 0xff,
+					   &hdlcd_plane_funcs,
+					   formats, ARRAY_SIZE(formats),
+					   NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (IS_ERR(plane))
+		return plane;
 
 	drm_plane_helper_add(plane, &hdlcd_plane_helper_funcs);
 	hdlcd->plane = plane;