message: demo: Fix MSVC warnings
  When NDEBUG is defined, result is unused :(
diff: @@ -548,6 +548,7 @@ void encodeIndexCoverage()
  {
  std::vector<unsigned char> shortbuffer(i);
  size_t result = meshopt_encodeIndexBuffer(i == 0 ? 0 : &shortbuffer[0], i, indices, index_count);
  + (void)result;
  if (i == buffer.size())
  assert(result == buffer.size());
  @@ -562,6 +563,7 @@ void encodeIndexCoverage()
  {
  std::vector<unsigned char> shortbuffer(buffer.begin(), buffer.begin() + i);
  int result = meshopt_decodeIndexBuffer(destination, index_count, i == 0 ? 0 : &shortbuffer[0], i);
  + (void)result;
  if (i == buffer.size())
  assert(result == 0);
  @@ -575,6 +577,8 @@ void encodeIndexCoverage()
  largebuffer.push_back(0);
  int result = meshopt_decodeIndexBuffer(destination, index_count, &largebuffer[0], largebuffer.size());
  + (void)result;
  +
  assert(result < 0);
  }
  }
  @@ -647,6 +651,7 @@ void encodeVertexCoverage()
  {
  std::vector<unsigned char> shortbuffer(i);
  size_t result = meshopt_encodeVertexBuffer(i == 0 ? 0 : &shortbuffer[0], i, vertices, vertex_count, sizeof(PV));
  + (void)result;
  if (i == buffer.size())
  assert(result == buffer.size());
  @@ -661,6 +666,7 @@ void encodeVertexCoverage()
  {
  std::vector<unsigned char> shortbuffer(buffer.begin(), buffer.begin() + i);
  int result = meshopt_decodeVertexBuffer(destination, vertex_count, sizeof(PV), i == 0 ? 0 : &shortbuffer[0], i);
  + (void)result;
  if (i == buffer.size())
  assert(result == 0);
  @@ -674,6 +680,8 @@ void encodeVertexCoverage()
  largebuffer.push_back(0);
  int result = meshopt_decodeVertexBuffer(destination, vertex_count, sizeof(PV), &largebuffer[0], largebuffer.size());
  + (void)result;
  +
  assert(result < 0);
  }
  }
  