Properly destroy the RS context.

Change-Id: I4c0f3ef510d99fc74b001e999eddcaffa63bc58a
diff --git a/src/com/android/wallpaper/galaxy/GalaxyWallpaper.java b/src/com/android/wallpaper/galaxy/GalaxyWallpaper.java
index 958c7c8..1dbf09a 100644
--- a/src/com/android/wallpaper/galaxy/GalaxyWallpaper.java
+++ b/src/com/android/wallpaper/galaxy/GalaxyWallpaper.java
@@ -47,6 +47,10 @@
                 mRenderer.stop();
                 mRenderer = null;
             }
+            if (mRs != null) {
+                mRs.destroy();
+                mRs = null;
+            }            
         }
 
         @Override
diff --git a/src/com/android/wallpaper/grass/GrassWallpaper.java b/src/com/android/wallpaper/grass/GrassWallpaper.java
index f399f81..3ee83b1 100644
--- a/src/com/android/wallpaper/grass/GrassWallpaper.java
+++ b/src/com/android/wallpaper/grass/GrassWallpaper.java
@@ -46,6 +46,10 @@
                 mRenderer.stop();
                 mRenderer = null;
             }
+            if (mRs != null) {
+                mRs.destroy();
+                mRs = null;
+            }            
         }
 
         @Override
@@ -88,3 +92,4 @@
         }
     }
 }
+