debug: fix crash in `debug examine --reupload-blobs`

cmd/restic/cmd_debug.go

@@ -325,6 +325,14 @@ func loadBlobs(ctx context.Context, repo restic.Repository, packID restic.ID, li
 		Name: packID.String(),
 		Type: restic.PackFile,
 	}
+
+	wg, ctx := errgroup.WithContext(ctx)
+
+	if reuploadBlobs {
+		repo.StartPackUploader(ctx, wg)
+	}
+
+	wg.Go(func() error {
 		for _, blob := range list {
 			Printf("      loading blob %v at %v (length %v)\n", blob.ID, blob.Offset, blob.Length)
 			buf := make([]byte, blob.Length)
@@ -399,13 +407,12 @@ func loadBlobs(ctx context.Context, repo restic.Repository, packID restic.ID, li
 		}
 
 		if reuploadBlobs {
-		err := repo.Flush(ctx)
-		if err != nil {
-			return err
+			return repo.Flush(ctx)
 		}
-	}
-
 		return nil
+	})
+
+	return wg.Wait()
 }
 
 func storePlainBlob(id restic.ID, prefix string, plain []byte) error {