[NaCl SDK] Remove invalid assert from nacl_io.

native_client_sdk/src/examples/api/graphics_3d/graphics_3d.cc

Index: native_client_sdk/src/examples/api/graphics_3d/graphics_3d.cc
diff --git a/native_client_sdk/src/examples/api/graphics_3d/graphics_3d.cc b/native_client_sdk/src/examples/api/graphics_3d/graphics_3d.cc
index 3ac841001e8654d5141944425b7f4ec8baeb84c8..3920839f7537eca7df24bfdc9aff96e22368d8fa 100644
--- a/native_client_sdk/src/examples/api/graphics_3d/graphics_3d.cc
+++ b/native_client_sdk/src/examples/api/graphics_3d/graphics_3d.cc
@@ -61,9 +61,11 @@ void DecompressTexture() {
    41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,
   };
   const uint8_t* input = &kRLETextureData[0];
-  const uint8_t * const input_end = &kRLETextureData[kRLETextureDataLength];
+  const uint8_t* const input_end = &kRLETextureData[kRLETextureDataLength];
   uint8_t* output = &g_texture_data[0];
-  const uint8_t * const output_end = &g_texture_data[kTextureDataLength];
+#ifndef NDEBUG
+  const uint8_t* const output_end = &g_texture_data[kTextureDataLength];
+#endif
 
   uint8_t decoded[4];
   int decoded_count = 0;