revision.c: remove implicit dependency on the_index

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/fast-export.c b/builtin/fast-export.c
index 9bd8a14..9bd4a95 100644
--- a/builtin/fast-export.c
+++ b/builtin/fast-export.c
@@ -1033,7 +1033,7 @@ int cmd_fast_export(int argc, const char **argv, const char *prefix)
 	/* we handle encodings */
 	git_config(git_default_config, NULL);
 
-	init_revisions(&revs, prefix);
+	repo_init_revisions(the_repository, &revs, prefix);
 	init_revision_sources(&revision_sources);
 	revs.topo_order = 1;
 	revs.sources = &revision_sources;