ASoC: Intel: sst: 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 those usages
straightforwardly with a new helper, sysfs_emit().
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20220801170108.26340-4-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/atom/sst/sst.c

@@ -242,9 +242,9 @@ static ssize_t firmware_version_show(struct device *dev,
 
 	if (ctx->fw_version.type == 0 && ctx->fw_version.major == 0 &&
 	    ctx->fw_version.minor == 0 && ctx->fw_version.build == 0)
-		return sprintf(buf, "FW not yet loaded\n");
+		return sysfs_emit(buf, "FW not yet loaded\n");
 	else
-		return sprintf(buf, "v%02x.%02x.%02x.%02x\n",
+		return sysfs_emit(buf, "v%02x.%02x.%02x.%02x\n",
 				  ctx->fw_version.type, ctx->fw_version.major,
 				  ctx->fw_version.minor, ctx->fw_version.build);