return port info to user so it can be parsed. Also fix a bug. #96
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list_ports collects useful info on ports, but just prints it to the console, which is not useful for parsing. By returning all that data to the user, it can be parsed to find the desired serial port device automatically.
Also, the "port == C_NULL && return" line causes the sp_free_port_list(ports) call to never be called. This is also fixed in this pull request.