Prevented SIGSEGV in isoburn_drive_scan_and_grab()

src/burn_wrap.c

@@ -122,7 +122,6 @@ int isoburn_drive_scan_and_grab(struct burn_drive_info *drive_infos[],
 
     ret= 0; goto ex;
  }
- o->treatment= treatment;
 
  if(treatment==1) {
    ret= burn_drive_scan_and_grab(drive_infos, adrpt, load);
@@ -143,6 +142,8 @@ int isoburn_drive_scan_and_grab(struct burn_drive_info *drive_infos[],
    /* >>> welcome file for modfication treatment */;
 
  }
+ if(o!=NULL)
+   o->treatment= treatment;
 
  ret= 1;
 ex: