commit 68bdcdc2f5d3c37d918f85368c2537a8aa7d90eb
from: Stefan Sperling <stsp@stsp.name>
date: Fri Jun 11 17:10:50 2021 UTC

addblk() may seek in its input file; reposition the file pointer afterwards

commit - a893025fd207950945eed1482170223a2d3b9ce3
commit + 68bdcdc2f5d3c37d918f85368c2537a8aa7d90eb
blob - a458b9192083dfe01fb591f80952bd08fbea9f26
blob + 45add0094489e3d46e675165b1d5379f56a01a4a
--- lib/deltify.c
+++ lib/deltify.c
@@ -268,6 +268,8 @@ got_deltify_init(struct got_delta_table **dt, FILE *f,
 		if (err)
 			goto done;
 		fileoffset += blocklen;
+		if (fseeko(f, fileoffset, SEEK_SET) == -1)
+			return got_error_from_errno("fseeko");
 	}
 done:
 	if (err) {