Clean up database in WidgetPreviewLoader
diff --git a/src/com/android/launcher2/WidgetPreviewLoader.java b/src/com/android/launcher2/WidgetPreviewLoader.java
index 052151c..a9bc098 100644
--- a/src/com/android/launcher2/WidgetPreviewLoader.java
+++ b/src/com/android/launcher2/WidgetPreviewLoader.java
@@ -352,6 +352,12 @@
         }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, (Void) null);
     }
 
+    public void closeDb()  {
+        if (mDb != null) {
+            mDb.close();
+        }
+    }
+
     private Bitmap readFromDb(String name, Bitmap b) {
         if (mCachedSelectQuery == null) {
             mCachedSelectQuery = WidgetPreviewCacheDb.COLUMN_NAME + " = ? AND " +