scsi: ibmvscsis: Fixed a bug reported by Dan Carpenter

SUPPORTED_FORMATS is 1 << 1 so it's never zero.

Signed-off-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Signed-off-by: Michael Cyr <mikecyr@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>