check return code of prepare_revision_walk

diff --git a/reachable.c b/reachable.c
index 00f289f2f470c0f4b95e0fcac043aa2e054d1ce6..823e3242ec126a5d55c36b24eb8699a2efecad52 100644 (file)
--- a/reachable.c
+++ b/reachable.c
@@ -215,6 +215,7 @@ void mark_reachable_objects(struct rev_info *revs, int mark_reflog)
         * Set up the revision walk - this will move all commits
         * from the pending list to the commit walking list.
         */
-       prepare_revision_walk(revs);
+       if (prepare_revision_walk(revs))
+               die("revision walk setup failed");
        walk_commit_list(revs);
 }