ASoC: mediatek: mt8192-mt6359: fix device_node leak

The of_parse_phandle() document:
    >>> Use of_node_put() on it when done.

The driver didn't call of_node_put().  Fixes the leak.
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20211214040028.2992627-1-tzungbi@google.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/mediatek/mt8192/mt8192-mt6359-rt1015-rt5682.c

@@ -1172,7 +1172,11 @@ static int mt8192_mt6359_dev_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	return devm_snd_soc_register_card(&pdev->dev, card);
+	ret = devm_snd_soc_register_card(&pdev->dev, card);
+
+	of_node_put(platform_node);
+	of_node_put(hdmi_codec);
+	return ret;
 }
 
 #ifdef CONFIG_OF