fix for fix keypad lighting up when screen backlight auto-adjusts

Change-Id: I61e987b4fcae277ab4a1ec6585b25255a445b238
diff --git a/exynos4/exynos4x12/liblights/lights.c b/exynos4/exynos4x12/liblights/lights.c
index de2f653..e8336d2 100644
--- a/exynos4/exynos4x12/liblights/lights.c
+++ b/exynos4/exynos4x12/liblights/lights.c
@@ -126,7 +126,7 @@
             struct light_state_t const *state)
 {
     int err = 0;
-    status int s_previous_brightness = -1;
+    static int s_previous_brightness = -1;
     int brightness = rgb_to_brightness(state);
 
     pthread_mutex_lock(&g_lock);