Missed GO transport error handling

[denis-gudim]

There is no error handling in the Go transport, which leads to undefined behavior

https://github.com/coinbase/cb-mpc/blob/master/demos-go/cb-mpc-go/internal/cgobinding/network.cpp#L137

Need to check result

if (result != SUCCESS) {
      return error_t(result);
 }