Fix the following coccicheck warning:
drivers/firewire/core-device.c:375:8-16:
WARNING: use scnprintf or sprintf

Signed-off-by: Xuezhi Zhang <zhangxuezhi1@coolpad.com>
---
 drivers/firewire/core-device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
index 90ed8fdaba75..5ad373419d00 100644
--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -372,7 +372,7 @@ static ssize_t rom_index_show(struct device *dev,
 	struct fw_device *device = fw_device(dev->parent);
 	struct fw_unit *unit = fw_unit(dev);
 
-	return snprintf(buf, PAGE_SIZE, "%d\n",
+	return sysfs_emit(buf, "%d\n",
 			(int)(unit->directory - device->config_rom));
 }
 
-- 
2.25.1