[Bf-blender-cvs] [b5390a4aeeb] master: Fix assert on blend file load when seek fails

[Campbell Barton]

Commit: b5390a4aeeb71671d282e244b422a7e065abfff5
Author: Campbell Barton
Date:   Mon Jan 9 22:03:14 2023 +1100
Branches: master
https://developer.blender.org/rBb5390a4aeeb71671d282e244b422a7e065abfff5

Fix assert on blend file load when seek fails

Only assert seek worked as expected when it doesn't return an error.

===================================================================

M	source/blender/blenloader/intern/readfile.cc

===================================================================

diff --git a/source/blender/blenloader/intern/readfile.cc b/source/blender/blenloader/intern/readfile.cc
index ed88495797d..91a72fb50c4 100644
--- a/source/blender/blenloader/intern/readfile.cc
+++ b/source/blender/blenloader/intern/readfile.cc
@@ -724,13 +724,15 @@ static BHeadN *get_bhead(FileData *fd)
           new_bhead->has_data = false;
           new_bhead->is_memchunk_identical = false;
           new_bhead->bhead = bhead;
-          off64_t seek_new = fd->file->seek(fd->file, bhead.len, SEEK_CUR);
-          if (seek_new == -1) {
+          const off64_t seek_new = fd->file->seek(fd->file, bhead.len, SEEK_CUR);
+          if (UNLIKELY(seek_new == -1)) {
             fd->is_eof = true;
             MEM_freeN(new_bhead);
             new_bhead = nullptr;
           }
-          BLI_assert(fd->file->offset == seek_new);
+          else {
+            BLI_assert(fd->file->offset == seek_new);
+          }
         }
         else {
           fd->is_eof = true;