[patch] gma500: silence an unused variable warning

[Dan Carpenter]

If CONFIG_BACKLIGHT_CLASS_DEVICE is disabled then GCC warns that:
        drivers/gpu/drm/gma500/opregion.c:154:6: warning:
                unused variable ?max? [-Wunused-variable]

Which give me a chance to use the new config_enabled() macro.  :)

Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

diff --git a/drivers/gpu/drm/gma500/opregion.c 
b/drivers/gpu/drm/gma500/opregion.c
index 05661bf..d2125ba 100644
--- a/drivers/gpu/drm/gma500/opregion.c
+++ b/drivers/gpu/drm/gma500/opregion.c
@@ -151,7 +151,6 @@ static u32 asle_set_backlight(struct drm_device *dev, u32 
bclp)
        struct drm_psb_private *dev_priv = dev->dev_private;
        struct opregion_asle *asle = dev_priv->opregion.asle;
        struct backlight_device *bd = dev_priv->backlight_device;
-       u32 max;

        DRM_DEBUG_DRIVER("asle set backlight %x\n", bclp);

@@ -165,11 +164,12 @@ static u32 asle_set_backlight(struct drm_device *dev, u32 
bclp)
        if (bclp > 255)
                return ASLE_BACKLIGHT_FAILED;

-#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
-       max = bd->props.max_brightness;
-       bd->props.brightness = bclp * max / 255;
-       backlight_update_status(bd);
-#endif
+       if (config_enabled(CONFIG_BACKLIGHT_CLASS_DEVICE)) {
+               int max = bd->props.max_brightness;
+               bd->props.brightness = bclp * max / 255;
+               backlight_update_status(bd);
+       }
+
        asle->cblv = (bclp * 0x64) / 0xff | ASLE_CBLV_VALID;

        return 0;