Fix sample to use API 14.

Change-Id: Iba9cb731a80f32972d61b8d7e55b4881cb81d36c
diff --git a/samples/RenderScript/Balls/src/com/example/android/rs/balls/balls.rs b/samples/RenderScript/Balls/src/com/example/android/rs/balls/balls.rs
index f94e3e2..d61557c 100644
--- a/samples/RenderScript/Balls/src/com/example/android/rs/balls/balls.rs
+++ b/samples/RenderScript/Balls/src/com/example/android/rs/balls/balls.rs
@@ -68,7 +68,7 @@
     bc.dimX = rsAllocationGetDimX(bc.ain);
     bc.dt = 1.f / 30.f;
 
-    rsForEach(physics_script, bc.ain, bc.aout, &bc);
+    rsForEach(physics_script, bc.ain, bc.aout, &bc, sizeof(bc));
 
     for (uint32_t ct=0; ct < bc.dimX; ct++) {
         point[ct].position = bout[ct].position;