Fix crash in clearWallpaper() am: a2bd512034
am: 2a8f8f008c

Change-Id: Ia73abd24d04d68c4895da8861a42af8f5887ef4c
diff --git a/core/java/android/app/WallpaperManager.java b/core/java/android/app/WallpaperManager.java
index a7ad619..aa0eaae 100644
--- a/core/java/android/app/WallpaperManager.java
+++ b/core/java/android/app/WallpaperManager.java
@@ -1393,7 +1393,8 @@
      */
     @SystemApi
     public void clearWallpaper() {
-        clearWallpaper(FLAG_SYSTEM | FLAG_LOCK, mContext.getUserId());
+        clearWallpaper(FLAG_LOCK, mContext.getUserId());
+        clearWallpaper(FLAG_SYSTEM, mContext.getUserId());
     }
 
     /**