Merge "Return a valid error code when adding an invalid IP address."

    if (ret == 0) {

        memcpy(ss, ai->ai_addr, ai->ai_addrlen);

        freeaddrinfo(ai);

    } else {

        // Getaddrinfo has its own error codes. Convert to negative errno.

        // There, the only thing that can reasonably happen is that the passed-in string is invalid.

        ret = (ret == EAI_SYSTEM) ? -errno : -EINVAL;

    }

    return ret;