ASoC: soc.h: add snd_soc_card_is_instantiated() helper

ASoC framework/driver checks whether card was instantiated every
where. Then, it should check card pointer too in such case.
This patch adds snd_soc_card_is_instantiated() for it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/875ycnfoqp.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc.h

@@ -1052,6 +1052,12 @@ struct snd_soc_card {
 #define for_each_card_widgets_safe(card, w, _w)	\
 	list_for_each_entry_safe(w, _w, &card->widgets, list)
 
+
+static inline int snd_soc_card_is_instantiated(struct snd_soc_card *card)
+{
+	return card && card->instantiated;
+}
+
 /* SoC machine DAI configuration, glues a codec and cpu DAI together */
 struct snd_soc_pcm_runtime {
 	struct device *dev;