ASoC: dapm: Simplify dapm_cnew_widget() with cleanup.h

Allocate the memory with scoped/cleanup.h in dapm_cnew_widget() to
reduce error handling (less error paths) and make the code a bit
simpler.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20240703-asoc-cleanup-h-v1-10-71219dfd0aef@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: krzk

sound/soc/soc-dapm.c

@@ -20,6 +20,7 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/async.h>
+#include <linux/cleanup.h>
 #include <linux/delay.h>
 #include <linux/pm.h>
 #include <linux/bitops.h>
@@ -323,30 +324,28 @@ static inline struct snd_soc_dapm_widget *dapm_cnew_widget(
 	const struct snd_soc_dapm_widget *_widget,
 	const char *prefix)
 {
-	struct snd_soc_dapm_widget *w;
-
-	w = kmemdup(_widget, sizeof(*_widget), GFP_KERNEL);
+	struct snd_soc_dapm_widget *w __free(kfree) = kmemdup(_widget,
+							      sizeof(*_widget),
+							      GFP_KERNEL);
 	if (!w)
 		return NULL;
 
 	if (prefix)
 		w->name = kasprintf(GFP_KERNEL, "%s %s", prefix, _widget->name);
 	else
 		w->name = kstrdup_const(_widget->name, GFP_KERNEL);
-	if (!w->name) {
-		kfree(w);
+	if (!w->name)
 		return NULL;
-	}
 
 	if (_widget->sname) {
 		w->sname = kstrdup_const(_widget->sname, GFP_KERNEL);
 		if (!w->sname) {
 			kfree_const(w->name);
-			kfree(w);
 			return NULL;
 		}
 	}
-	return w;
+
+	return_ptr(w);
 }
 
 struct dapm_kcontrol_data {