Fixed array-index-out-of-bound in Teapot sample

Fix issue used to crash on MIPS/X86 device.  ARM device works by accident

Change-Id: I401f4954841b6f59d3ea001e5e6a70c46045a7e1
diff --git a/ndk/platforms/android-18/samples/Teapot/jni/TeapotRenderer.cpp b/ndk/platforms/android-18/samples/Teapot/jni/TeapotRenderer.cpp
index 61f2d30..457d621 100644
--- a/ndk/platforms/android-18/samples/Teapot/jni/TeapotRenderer.cpp
+++ b/ndk/platforms/android-18/samples/Teapot/jni/TeapotRenderer.cpp
@@ -62,7 +62,7 @@
     glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
 
     //Create VBO
-    _iNumVertices = sizeof(teapotPositions) / sizeof(teapotPositions[0]);
+    _iNumVertices = sizeof(teapotPositions) / sizeof(teapotPositions[0]) / 3;
     int32_t iStride = sizeof(TEAPOT_VERTEX);
     int32_t iIndex = 0;
     TEAPOT_VERTEX* p = new TEAPOT_VERTEX[_iNumVertices];