message: fix block height
diff: @@ -88,7 +88,7 @@ unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nF
  // ppcoin: retarget with exponential moving toward target spacing
  arith_uint256 bnNew;
  bnNew.SetCompact(pindexLast->nBits);
  - int64_t nInterval = params.DifficultyAdjustmentInterval(pindexLast->nHeight);
  + int64_t nInterval = params.DifficultyAdjustmentInterval(pindexLast->nHeight + 1);
  bnNew *= ((nInterval - 1) * nTargetSpacing + nActualSpacing + nActualSpacing);
  bnNew /= ((nInterval + 1) * nTargetSpacing);
  