Add the mediaplayer release in the test validation. This is to ensure the media player release properly.

Change-Id: Ia4758a3c549b64b6efead18e7538d977dee2be76
diff --git a/media/tests/MediaFrameworkTest/src/com/android/mediaframeworktest/stress/MediaRecorderStressTest.java b/media/tests/MediaFrameworkTest/src/com/android/mediaframeworktest/stress/MediaRecorderStressTest.java
index 3908d71..b4ae593 100644
--- a/media/tests/MediaFrameworkTest/src/com/android/mediaframeworktest/stress/MediaRecorderStressTest.java
+++ b/media/tests/MediaFrameworkTest/src/com/android/mediaframeworktest/stress/MediaRecorderStressTest.java
@@ -300,6 +300,7 @@
             if (duration <= 0){
                 assertTrue("stressRecordAndPlayback", false);
             }
+            mp.release();
         } catch (Exception e) {
             assertTrue("stressRecordAndPlayback", false);
         }