Fix the following coccicheck warning:
./drivers/hid/wacom_sys.c:1828:8-16: WARNING: use scnprintf or sprintf.
Reported-by: Abaci Robot<abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
        struct hid_device *hdev = to_hid_device(dev);
        struct wacom *wacom = hid_get_drvdata(hdev);
 
-       return snprintf(buf, PAGE_SIZE, "%i\n", wacom->wacom_wac.bt_high_speed);
+       return sysfs_emit(buf, "%i\n", wacom->wacom_wac.bt_high_speed);
 }
 
 static ssize_t wacom_store_speed(struct device *dev,