[PATCH v2] acpi_system_write_wakeup_device(): fix error check for unsigned variable.

[Cyril Roelandt <tipecaml@gmail.com>]

The LEN variable is unsigned, therefore checking whether it is less than 0 is
useless. Also drop the LEN variable, since the COUNT parameter can be used
instead.

Signed-off-by: Cyril Roelandt <tipecaml@gmail.com>
---
 drivers/acpi/proc.c |   11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/acpi/proc.c b/drivers/acpi/proc.c
index 27adb09..ef98796 100644
--- a/drivers/acpi/proc.c
+++ b/drivers/acpi/proc.c
@@ -362,16 +362,13 @@ acpi_system_write_wakeup_device(struct file *file,
 	struct list_head *node, *next;
 	char strbuf[5];
 	char str[5] = "";
-	unsigned int len = count;
 
-	if (len > 4)
-		len = 4;
-	if (len < 0)
-		return -EFAULT;
+	if (count > 4)
+		count = 4;
 
-	if (copy_from_user(strbuf, buffer, len))
+	if (copy_from_user(strbuf, buffer, count))
 		return -EFAULT;
-	strbuf[len] = '\0';
+	strbuf[count] = '\0';
 	sscanf(strbuf, "%s", str);
 
 	mutex_lock(&acpi_device_lock);
-- 
1.7.10.4