asus-wmi: signedness bug in read_brightness()

"err" needs to be signed for the error handling to work.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 5b779a9443d6..a038595200ee 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -946,7 +946,8 @@ static int read_brightness_max(struct asus_wmi *asus)
 static int read_brightness(struct backlight_device *bd)
 {
         struct asus_wmi *asus = bl_get_data(bd);
-        u32 retval, err;
+        u32 retval;
+        int err;
 
         err = asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_BRIGHTNESS, &retval);