scsi: dpt_i2o: Use after free in I2ORESETCMD ioctl

Here is another use after free if we reset the card.  The adpt_hba_reset()
function frees "pHba" on error.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/dpt_i2o.c

@@ -2051,13 +2051,16 @@ static int adpt_ioctl(struct inode *inode, struct file *file, uint cmd, ulong ar
 		}
 		break;
 		}
-	case I2ORESETCMD:
-		if(pHba->host)
-			spin_lock_irqsave(pHba->host->host_lock, flags);
+	case I2ORESETCMD: {
+		struct Scsi_Host *shost = pHba->host;
+
+		if (shost)
+			spin_lock_irqsave(shost->host_lock, flags);
 		adpt_hba_reset(pHba);
-		if(pHba->host)
-			spin_unlock_irqrestore(pHba->host->host_lock, flags);
+		if (shost)
+			spin_unlock_irqrestore(shost->host_lock, flags);
 		break;
+	}
 	case I2ORESCANCMD:
 		adpt_rescan(pHba);
 		break;