Check if rename of backed up file fails before persisting new changes.

If not these system services will end up with inconsistent settings files
when the device runs out of storage.
Delete mangled settings file in PackageManager if the current write fails
so that we don't end up overwriting the backed up version with the
mangled version
Include null check when retrieving fwd locked resource for an existing package

services/java/com/android/server/AppWidgetService.java

@@ -816,7 +816,10 @@ class AppWidgetService extends IAppWidgetService.Stub
             temp.delete();
         }
 
-        writeStateToFileLocked(temp);
+        if (!writeStateToFileLocked(temp)) {
+            Log.w(TAG, "Failed to persist new settings");
+            return;
+        }
 
         //noinspection ResultOfMethodCallIgnored
         real.delete();
@@ -824,7 +827,7 @@ class AppWidgetService extends IAppWidgetService.Stub
         temp.renameTo(real);
     }
 
-    void writeStateToFileLocked(File file) {
+    boolean writeStateToFileLocked(File file) {
         FileOutputStream stream = null;
         int N;
 
@@ -877,6 +880,7 @@ class AppWidgetService extends IAppWidgetService.Stub
 
             out.endDocument();
             stream.close();
+            return true;
         } catch (IOException e) {
             try {
                 if (stream != null) {
@@ -889,6 +893,7 @@ class AppWidgetService extends IAppWidgetService.Stub
                 //noinspection ResultOfMethodCallIgnored
                 file.delete();
             }
+            return false;
         }
     }