TIF: Release passthrough session when HardwareSession is released

Bug: https://code.google.com/p/android/issues/detail?id=200114
Change-Id: I5d74eb56297e468b95aa0f99b159b2b54f93f5d2

media/java/android/media/tv/TvInputService.java

@@ -1940,6 +1940,15 @@ public abstract class TvInputService extends Service {
          * </ul>
          */
         public void onHardwareVideoUnavailable(int reason) { }
+
+        @Override
+        void release() {
+            if (mHardwareSession != null) {
+                mHardwareSession.release();
+                mHardwareSession = null;
+            }
+            super.release();
+        }
     }
 
     /** @hide */