message: lite/microfrontend: fix FilterbankState unsigned type missmatch
  FilterbankState work is uint64_t*, casting a signed type prevent the
  libraries to compile w/ the esp32 arduino core toolchain.
diff: @@ -118,7 +118,7 @@ static uint32_t Sqrt64(uint64_t num) {
  uint32_t* FilterbankSqrt(struct FilterbankState* state, int scale_down_shift) {
  const int num_channels = state->num_channels;
  - const int64_t* work = state->work + 1;
  + const uint64_t* work = state->work + 1;
  // Reuse the work buffer since we're fine clobbering it at this point to hold
  // the output.
  uint32_t* output = (uint32_t*)state->work;
  