refactoring to typed Size

Go is amazing with refactoring!

weed/server/volume_grpc_admin.go

@@ -199,7 +199,7 @@ func (vs *VolumeServer) VolumeNeedleStatus(ctx context.Context, req *volume_serv
 
 	resp.NeedleId = uint64(n.Id)
 	resp.Cookie = uint32(n.Cookie)
-	resp.Size = n.Size
+	resp.Size = uint32(n.Size)
 	resp.LastModified = n.LastModified
 	resp.Crc = n.Checksum.Value()
 	if n.HasTtl() {

weed/server/volume_grpc_batch_delete.go

@@ -79,7 +79,7 @@ func (vs *VolumeServer) BatchDelete(ctx context.Context, req *volume_server_pb.B
 			resp.Results = append(resp.Results, &volume_server_pb.DeleteResult{
 				FileId: fid,
 				Status: http.StatusAccepted,
-				Size:   size},
+				Size:   uint32(size)},
 			)
 		}
 	}