ASoC: omap: Replace sprintf() with sysfs_emit()

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 new helpers, sysfs_emit() and sysfs_emit_at(), with the proper
string offset.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Link: https://lore.kernel.org/r/20220801170108.26340-9-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/ti/omap-mcbsp-st.c

@@ -244,10 +244,10 @@ static ssize_t st_taps_show(struct device *dev,
 
 	spin_lock_irq(&mcbsp->lock);
 	for (i = 0; i < st_data->nr_taps; i++)
-		status += sprintf(&buf[status], (i ? ", %d" : "%d"),
+		status += sysfs_emit_at(buf, status, (i ? ", %d" : "%d"),
 					st_data->taps[i]);
 	if (i)
-		status += sprintf(&buf[status], "\n");
+		status += sysfs_emit_at(buf, status, "\n");
 	spin_unlock_irq(&mcbsp->lock);
 
 	return status;

sound/soc/ti/omap-mcbsp.c

@@ -517,7 +517,7 @@ static ssize_t prop##_show(struct device *dev,				\
 {									\
 	struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);		\
 									\
-	return sprintf(buf, "%u\n", mcbsp->prop);			\
+	return sysfs_emit(buf, "%u\n", mcbsp->prop);			\
 }									\
 									\
 static ssize_t prop##_store(struct device *dev,				\
@@ -560,11 +560,11 @@ static ssize_t dma_op_mode_show(struct device *dev,
 
 	for (s = &dma_op_modes[i]; i < ARRAY_SIZE(dma_op_modes); s++, i++) {
 		if (dma_op_mode == i)
-			len += sprintf(buf + len, "[%s] ", *s);
+			len += sysfs_emit_at(buf, len, "[%s] ", *s);
 		else
-			len += sprintf(buf + len, "%s ", *s);
+			len += sysfs_emit_at(buf, len, "%s ", *s);
 	}
-	len += sprintf(buf + len, "\n");
+	len += sysfs_emit_at(buf, len, "\n");
 
 	return len;
 }