message: fix signature check error
diff: @@ -30,7 +30,7 @@ namespace eosio { namespace chain {
  struct transaction_header {
  time_point_sec expiration; ///< the time at which a transaction expires
  fc::unsigned_int max_net_usage_words = 0UL; /// upper limit on total network bandwidth (in 8 byte words) billed for this transaction
  - fc::signed_int max_ram_usage = std::numeric_limits<int32_t>::max(); /// max ram used by transaction
  + int32_t max_ram_usage = std::numeric_limits<int32_t>::max(); /// max ram used by transaction
  fc::unsigned_int delay_sec = 0UL; /// number of seconds to delay this transaction for during which it may be canceled.
  uint32_t ref_block_prefix = 0UL; ///< specifies the lower 32 bits of the blockid at get_ref_blocknum
  uint16_t ref_block_num = 0U; ///< specifies a block num in the last 2^16 blocks.
  