aacraid: IOCTL pass-through command fix

aacraid: IOCTL pass-through command fix

The Linux aacriad driver fails to detect the case of SG list count=0 on IOCTL
pass-through command and cause intermittent fault.  The result is the Linux
aacriad driver send down IOCTL pass-through command with one not initialized
SG list to firmware when receiving SG list count =0 on pass-through command.

Signed-off-by: Mahesh Rajashekhara <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Reviewed-by: Murthy Bhat <[email protected]>
Signed-off-by: James Bottomley <[email protected]>