message: fix bitSize typo in bignum for openssl
diff: @@ -273,7 +273,7 @@ public:
  uint256 getuint256() const
  {
  - if(bitsize() > 256){
  + if(bitSize() > 256){
  throw std::range_error("cannot convert to uint256, bignum longer than 256 bits");
  }
  unsigned int nSize = BN_bn2mpi(bn, NULL);
  