[NaCl SDK] Remove invalid assert from nacl_io.

native_client_sdk/src/examples/demo/voronoi/voronoi.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <assert.h>
 #include <math.h>
 #include <ppapi/c/ppb_input_event.h>
 #include <ppapi/cpp/input_event.h>
 #include <ppapi/cpp/var.h>
 #include <ppapi/cpp/var_array.h>
@@ skipping 42 matching lines @@
 inline float frand() {
   return (static_cast<float>(rand_r(&g_rand_state)) /
       static_cast<float>(RAND_MAX));
 }
 
 // reset random seed
 inline void rand_reset(unsigned int seed) {
   g_rand_state = seed;
 }
 
+#ifndef NDEBUG
 // returns true if input is power of two.
+// only used in assertions.
 inline bool is_pow2(int x) {
   return (x & (x - 1)) == 0;
 }
+#endif
 
 inline double getseconds() {
   const double usec_to_sec = 0.000001;
   timeval tv;
   if (0 == gettimeofday(&tv, NULL))
     return tv.tv_sec + tv.tv_usec * usec_to_sec;
   return 0.0;
 }
 
 // BGRA helper function, for constructing a pixel for a BGRA buffer.
@@ skipping 439 matching lines @@
     // Do simulation, render and present.
     voronoi.Update();
   }
 
   return 0;
 }
 
 // Register the function to call once the Instance Object is initialized.
 // see: pappi_simple/ps_main.h
 PPAPI_SIMPLE_REGISTER_MAIN(example_main);