[SCSI] fix scsi_find_device()

drivers/scsi/hosts.h

@@ -605,8 +605,8 @@ static inline Scsi_Device *scsi_find_device(struct Scsi_Host *shost,
 	list_for_each_entry (sdev, &shost->my_devices, siblings)
                 if (sdev->channel == channel && sdev->id == pun
                    && sdev->lun ==lun)
-                        break;
-        return sdev;
+                        return sdev;
+        return NULL;
 }
 
 /*

drivers/scsi/scsi_scan.c

@@ -1758,7 +1758,7 @@ int scsi_add_single_device(uint host, uint channel, uint id, uint lun)
 	shost = scsi_host_hn_get(host);
 	if (!shost)
 		return -ENODEV;
-	if(scsi_find_device(shost, channel, id, lun) == NULL)
+	if(scsi_find_device(shost, channel, id, lun) != NULL)
 		goto out;
 
 	if (scsi_probe_and_add_lun(shost, NULL, channel, id, lun, NULL) ==