drm/mediatek: Fix probe memory leak

commit 5e49200 upstream.

The Mediatek DRM driver allocates private data for components without a
platform driver but as the lifetime is tied to each component device,
the memory is never freed.

Tie the allocation lifetime to the DRM platform device so that the
memory is released on probe failure (e.g. probe deferral) and when the
driver is unbound.

Fixes: c0d36de ("drm/mediatek: Move clk info from struct mtk_ddp_comp to sub driver private data")
Cc: stable@vger.kernel.org	# 5.12
Cc: CK Hu <ck.hu@mediatek.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20250923152340.18234-3-johan@kernel.org/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: jhovold

drivers/gpu/drm/mediatek/mtk_ddp_comp.c

@@ -671,7 +671,7 @@ int mtk_ddp_comp_init(struct device *dev, struct device_node *node, struct mtk_d
 	    type == MTK_DSI)
 		return 0;
 
-	priv = devm_kzalloc(comp->dev, sizeof(*priv), GFP_KERNEL);
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;