Messaging: Nullability

Change-Id: I8bcde2a868a9c8989971d056be24ff4986e4f8f3

src/com/android/messaging/mmslib/pdu/EncodedStringValue.java

@@ -1,6 +1,7 @@
 /*
  * Copyright (C) 2007-2008 Esmertec AG.
  * Copyright (C) 2007-2008 The Android Open Source Project
+ * Copyright (C) 2024 The LineageOS Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,6 +20,8 @@ package com.android.messaging.mmslib.pdu;
 
 import android.util.Log;
 
+import androidx.annotation.NonNull;
+
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.UnsupportedEncodingException;
@@ -201,6 +204,7 @@ public class EncodedStringValue implements Cloneable {
      * (non-Javadoc)
      * @see java.lang.Object#clone()
      */
+    @NonNull
     @Override
     public Object clone() throws CloneNotSupportedException {
         int len = mData.length;