message: * Fix compilation errors
diff: @@ -29,7 +29,7 @@ pub extern fn sovrin_create_pool_ledger_config(command_handle: i32,
  config_name: *const c_char,
  config: *const c_char,
  cb: Option<extern fn(xcommand_handle: i32, err: ErrorCode)>) -> ErrorCode {
  - check_useful_c_str!(name, ErrorCode::CommonInvalidParam2);
  + check_useful_c_str!(config_name, ErrorCode::CommonInvalidParam2);
  check_useful_opt_c_str!(config, ErrorCode::CommonInvalidParam3);
  check_useful_c_callback!(cb, ErrorCode::CommonInvalidParam4);
  @@ -75,7 +75,7 @@ pub extern fn sovrin_open_pool_ledger(command_handle: i32,
  config_name: *const c_char,
  config: *const c_char,
  cb: Option<extern fn(xcommand_handle: i32, err: ErrorCode, pool_handle: i32)>) -> ErrorCode {
  - check_useful_c_str!(name, ErrorCode::CommonInvalidParam2);
  + check_useful_c_str!(config_name, ErrorCode::CommonInvalidParam2);
  check_useful_opt_c_str!(config, ErrorCode::CommonInvalidParam3);
  check_useful_c_callback!(cb, ErrorCode::CommonInvalidParam4);
  @@ -165,7 +165,7 @@ pub extern fn sovrin_close_pool_ledger(command_handle: i32,
  pub extern fn sovrin_delete_pool_ledger_config(command_handle: i32,
  config_name: *const c_char,
  cb: Option<extern fn(xcommand_handle: i32, err: ErrorCode)>) -> ErrorCode {
  - check_useful_c_str!(name, ErrorCode::CommonInvalidParam2);
  + check_useful_c_str!(config_name, ErrorCode::CommonInvalidParam2);
  check_useful_c_callback!(cb, ErrorCode::CommonInvalidParam3);
  let result = CommandExecutor::instance()
  