message: [core] check index channel before accessing center_frequencies_
diff: @@ -100,8 +100,8 @@ bool MfccMelFilterbank::Initialize(int input_length, double input_sample_rate,
  if ((i < start_index_) || (i > end_index_)) {
  band_mapper_[i] = -2; // Indicate an unused Fourier coefficient.
  } else {
  - while ((center_frequencies_[channel] < melf) &&
  - (channel < num_channels_)) {
  + while ((channel < num_channels_) &&
  + (center_frequencies_[channel] < melf)) {
  ++channel;
  }
  band_mapper_[i] = channel - 1; // Can be == -1
  