message: initialize bitbuf_size to 0 to avoid filling buffer when not needed
diff: @@ -124,7 +124,7 @@ uint256 GetRandHash()
  FastRandomContext::FastRandomContext(bool fDeterministic)
  {
  - FillBitBuffer();
  + bitbuf_size = 0;
  // The seed values have some unlikely fixed points which we avoid.
  if (fDeterministic)
  {
  