[PATCH V2 3/14] sony-laptop: replace simple_strtoul with strict_strtoul

[Marco Chiappero <marco@absence.it>]

Any occurrence of simple_strtoul has been replaced with the better
strict_strtoul, because the former accepts and ignores any char at the
tail while the latter only accepts a new line character following the
number (and -EINVAL is returned otherwise).

Signed-off-by: Marco Chiappero <marco@absence.it> 
--- 

--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -919,7 +919,8 @@ static ssize_t sony_nc_sysfs_store(struc
 	if (count > 31)
 		return -EINVAL;
 
-	value = simple_strtoul(buffer, NULL, 10);
+	if (strict_strtoul(buffer, 10, &value))
+		return -EINVAL;
 
 	if (item->validate)
 		value = item->validate(SNC_VALIDATE_IN, value);
@@ -2437,7 +2438,9 @@ static ssize_t sony_pic_wwanpower_store(
 	if (count > 31)
 		return -EINVAL;
 
-	value = simple_strtoul(buffer, NULL, 10);
+	if (strict_strtoul(buffer, 10, &value))
+		return -EINVAL;
+
 	mutex_lock(&spic_dev.lock);
 	__sony_pic_set_wwanpower(value);
 	mutex_unlock(&spic_dev.lock);
@@ -2474,7 +2477,9 @@ static ssize_t sony_pic_bluetoothpower_s
 	if (count > 31)
 		return -EINVAL;
 
-	value = simple_strtoul(buffer, NULL, 10);
+	if (strict_strtoul(buffer, 10, &value))
+		return -EINVAL;
+
 	mutex_lock(&spic_dev.lock);
 	__sony_pic_set_bluetoothpower(value);
 	mutex_unlock(&spic_dev.lock);
@@ -2513,7 +2518,9 @@ static ssize_t sony_pic_fanspeed_store(s
 	if (count > 31)
 		return -EINVAL;
 
-	value = simple_strtoul(buffer, NULL, 10);
+	if (strict_strtoul(buffer, 10, &value))
+		return -EINVAL;
+
 	if (sony_pic_set_fanspeed(value))
 		return -EIO;