can: janz-ican3: use sysfs_emit() in fwinfo_show()

As recommended in Documentation/filesystems/sysfs.rst, show() callbacks
should use sysfs_emit() or sysfs_emit_at() to format values returned to
userspace. Replace scnprintf() with sysfs_emit() in fwinfo_show().

Signed-off-by: Khaled Elnaggar <khaledelnaggarlinux@gmail.com>
Link: https://patch.msgid.link/20250712133609.331904-1-khaledelnaggarlinux@gmail.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Author: Khaled Elnaggar

drivers/net/can/janz-ican3.c

@@ -1867,7 +1867,7 @@ static ssize_t fwinfo_show(struct device *dev,
 {
 	struct ican3_dev *mod = netdev_priv(to_net_dev(dev));
 
-	return scnprintf(buf, PAGE_SIZE, "%s\n", mod->fwinfo);
+	return sysfs_emit(buf, "%s\n", mod->fwinfo);
 }
 
 static DEVICE_ATTR_RW(termination);