scsi: aacraid: fix leak of data from stack back to userspace

The fields sense_data_size and sense_data are unitialized garbage from
the stack and are being copied back to userspace.  Fix this leak of
stack information by ensuring they are zero'd.

Detected by CoverityScan, CID#1435473 ("Uninitialized scalar variable")

Fixes: 423400e64d377 ("scsi: aacraid: Include HBA direct interface")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Dave Carroll <david.carroll@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/aacraid/commctrl.c

@@ -955,6 +955,8 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
 			reply.srb_status = SRB_STATUS_SUCCESS;
 			reply.scsi_status = 0;
 			reply.data_xfer_length = byte_count;
+			reply.sense_data_size = 0;
+			memset(reply.sense_data, 0, AAC_SENSE_BUFFERSIZE);
 		} else {
 			reply.srb_status = err->service_response;
 			reply.scsi_status = err->status;