platform/x86: asus-wmi: Replace sscanf() with kstrtoint()

The use of sscanf() is an overkill here. Moreover, there is no need to check
for count to be 0, since it's guaranteed by sysfs not to be.

Taking above into account, replace sscanf() with kstrtoint() calls.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/platform/x86/asus-wmi.c

@@ -1989,32 +1989,25 @@ static int asus_wmi_notify_queue_flush(struct asus_wmi *asus)
 
 /* Sysfs **********************************************************************/
 
-static int parse_arg(const char *buf, unsigned long count, int *val)
-{
-	if (!count)
-		return 0;
-	if (sscanf(buf, "%i", val) != 1)
-		return -EINVAL;
-	return count;
-}
-
 static ssize_t store_sys_wmi(struct asus_wmi *asus, int devid,
 			     const char *buf, size_t count)
 {
 	u32 retval;
-	int rv, err, value;
+	int err, value;
 
 	value = asus_wmi_get_devstate_simple(asus, devid);
 	if (value < 0)
 		return value;
 
-	rv = parse_arg(buf, count, &value);
-	err = asus_wmi_set_devstate(devid, value, &retval);
+	err = kstrtoint(buf, 0, &value);
+	if (err)
+		return err;
 
+	err = asus_wmi_set_devstate(devid, value, &retval);
 	if (err < 0)
 		return err;
 
-	return rv;
+	return count;
 }
 
 static ssize_t show_sys_wmi(struct asus_wmi *asus, int devid, char *buf)
@@ -2063,8 +2056,10 @@ static ssize_t cpufv_store(struct device *dev, struct device_attribute *attr,
 {
 	int value, rv;
 
-	if (!count || sscanf(buf, "%i", &value) != 1)
-		return -EINVAL;
+	rv = kstrtoint(buf, 0, &value);
+	if (rv)
+		return rv;
+
 	if (value < 0 || value > 2)
 		return -EINVAL;