ASoC: simple-card: Fix missing of_node_put() at simple_dai_link_of()

We forgot to unreference the platform node object obtained from
of_get_child_by_name().  This leads to the unbalance of node
refcount.

Fixes: e0ae225b ("ASoC: simple-card: support platform in dts parse")
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/generic/simple-card.c

@@ -421,6 +421,7 @@ static int simple_dai_link_of(struct simple_priv *priv,
 	asoc_simple_card_canonicalize_platform(dai_link);
 
 dai_link_of_err:
+	of_node_put(plat);
 	of_node_put(node);
 
 	return ret;