ASoC: soc-dapm.c: ignore parameter NULL at snd_soc_dapm_free_widget()

Currently snd_soc_dapm_free_widget() is assuming input parameter is
non NULL. Thus, caller need to care about it.
This patch care it at snd_soc_dapm_free_widget().
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Link: https://lore.kernel.org/r/875yggtzsq.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/hda.c

@@ -130,10 +130,8 @@ static void hda_codec_unregister_dais(struct hda_codec *codec,
 			if (strcmp(dai->driver->name, pcm->name))
 				continue;
 
-			if (dai->playback_widget)
-				snd_soc_dapm_free_widget(dai->playback_widget);
-			if (dai->capture_widget)
-				snd_soc_dapm_free_widget(dai->capture_widget);
+			snd_soc_dapm_free_widget(dai->playback_widget);
+			snd_soc_dapm_free_widget(dai->capture_widget);
 			snd_soc_unregister_dai(dai);
 			break;
 		}

sound/soc/intel/avs/pcm.c

@@ -1016,10 +1016,8 @@ static void avs_component_hda_unregister_dais(struct snd_soc_component *componen
 		if (!strstr(dai->driver->name, name))
 			continue;
 
-		if (dai->playback_widget)
-			snd_soc_dapm_free_widget(dai->playback_widget);
-		if (dai->capture_widget)
-			snd_soc_dapm_free_widget(dai->capture_widget);
+		snd_soc_dapm_free_widget(dai->playback_widget);
+		snd_soc_dapm_free_widget(dai->capture_widget);
 		snd_soc_unregister_dai(dai);
 	}
 }

sound/soc/soc-dapm.c

@@ -2489,6 +2489,9 @@ void snd_soc_dapm_free_widget(struct snd_soc_dapm_widget *w)
 	struct snd_soc_dapm_path *p, *next_p;
 	enum snd_soc_dapm_direction dir;
 
+	if (!w)
+		return;
+
 	list_del(&w->list);
 	list_del(&w->dirty);
 	/*