ASoC: simple-card: remove unused variable from simple_parse_of()

commit d9ffff69 ("ASoC: simple-card: Use snd_soc_of_parse_aux_devs()")
switched to use snd_soc_of_parse_aux_devs() on simple_parse_of().
Thus noone is using *top anymore. Let's cleanup unused variable.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87pmyxzs9w.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/generic/simple-card.c

@@ -441,15 +441,10 @@ static int simple_for_each_link(struct asoc_simple_priv *priv,
 
 static int simple_parse_of(struct asoc_simple_priv *priv)
 {
-	struct device *dev = simple_priv_to_dev(priv);
-	struct device_node *top = dev->of_node;
 	struct snd_soc_card *card = simple_priv_to_card(priv);
 	struct link_info li;
 	int ret;
 
-	if (!top)
-		return -EINVAL;
-
 	ret = asoc_simple_parse_widgets(card, PREFIX);
 	if (ret < 0)
 		return ret;