sony-laptop: report failures on setting LCD brightness

Check if we were successful in setting the requested brightness and
report failure in that case.

Signed-off-by: Mattia Dongili <[e-mail]>
Signed-off-by: Matthew Garrett <[e-mail]>

drivers/platform/x86/sony-laptop.c

···
 	int *handle = (int *)bl_get_data(bd);
 
 	value = bd->props.brightness;
-	sony_call_snc_handle(*handle, 0x0100 | (value << 16), &result);
+	if (sony_call_snc_handle(*handle, 0x0100 | (value << 16), &result))
+		return -EIO;
 
-	return sony_nc_get_brightness_ng(bd);
+	return value;
 }
 
 static const struct backlight_ops sony_backlight_ops = {