ASoC: DAPM: Replace sprintf() calls with sysfs_emit_at()

For sysfs outputs, it's safer to use a new helper, sysfs_emit(),
instead of the raw sprintf() & co.  This patch replaces the open-code
with a new helper, sysfs_emit_at(), by passing the string offset.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20220801170108.26340-8-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-dapm.c

@@ -2386,11 +2386,10 @@ int snd_soc_dapm_mixer_update_power(struct snd_soc_dapm_context *dapm,
 EXPORT_SYMBOL_GPL(snd_soc_dapm_mixer_update_power);
 
 static ssize_t dapm_widget_show_component(struct snd_soc_component *cmpnt,
-	char *buf)
+					  char *buf, int count)
 {
 	struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(cmpnt);
 	struct snd_soc_dapm_widget *w;
-	int count = 0;
 	char *state = "not set";
 
 	/* card won't be set for the dummy component, as a spot fix
@@ -2423,7 +2422,7 @@ static ssize_t dapm_widget_show_component(struct snd_soc_component *cmpnt,
 		case snd_soc_dapm_pinctrl:
 		case snd_soc_dapm_clock_supply:
 			if (w->name)
-				count += sprintf(buf + count, "%s: %s\n",
+				count += sysfs_emit_at(buf, count, "%s: %s\n",
 					w->name, w->power ? "On":"Off");
 		break;
 		default:
@@ -2445,7 +2444,7 @@ static ssize_t dapm_widget_show_component(struct snd_soc_component *cmpnt,
 		state = "Off";
 		break;
 	}
-	count += sprintf(buf + count, "PM State: %s\n", state);
+	count += sysfs_emit_at(buf, count, "PM State: %s\n", state);
 
 	return count;
 }
@@ -2463,7 +2462,7 @@ static ssize_t dapm_widget_show(struct device *dev,
 	for_each_rtd_codec_dais(rtd, i, codec_dai) {
 		struct snd_soc_component *cmpnt = codec_dai->component;
 
-		count += dapm_widget_show_component(cmpnt, buf + count);
+		count = dapm_widget_show_component(cmpnt, buf, count);
 	}
 
 	mutex_unlock(&rtd->card->dapm_mutex);