message: guard chainActive in GetInputAge
diff: @@ -722,7 +722,7 @@ int GetInputAge(CTxIn& vin)
  if (coins) {
  if (coins->nHeight < 0) return 0;
  - return (chainActive.Tip()->nHeight + 1) - coins->nHeight;
  + return WITH_LOCK(cs_main, return chainActive.Height() + 1) - coins->nHeight;
  } else
  return -1;
  }
  