Fix bug when controler does not support RAID (jbod only)

When no raid function is available ex : LSI 9202 16E, sas2ircu <controler> status return : 

```
# sas2ircu 0 status
LSI Corporation SAS2 IR Configuration Utility.
Version 16.00.00.00 (2013.03.01) 
Copyright (c) 2009-2013 LSI Corporation. All rights reserved. 

SAS2IRCU: The STATUS command is not supported by the firmware currently loaded on controller 0.
```