Use the new scan2

Signed-off-by: Vincent Liu <[email protected]>

Author: Vincent-lau

ocaml/xapi/storage_mux.ml

@@ -373,7 +373,7 @@ module Mux = struct
         ) ;
       Server_helpers.exec_with_new_task "SR.update_snapshot_info_dest"
         ~subtask_of:(Ref.of_string dbg) (fun __context ->
-          let local_vdis = scan () ~dbg ~sr in
+          let local_vdis, _ = scan2 () ~dbg ~sr in
           let find_sm_vdi ~vdi ~vdi_info_list =
             try List.find (fun x -> x.vdi = vdi) vdi_info_list
             with Not_found ->