ui-log: don't free diff object when outputting diff

In git 2.36, the logic for diff_flush() changed, resulting in our object
getting freed, which led to following renames producing garbage commits
until it eventually crashed.

Fixes: bb02e24 ("git: update to v2.36.0")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 file changed, 1 insertion, 0 deletions

diff --git a/ui-log.c b/ui-log.c
index 31fb783..c7b3b3f 100644
--- a/ui-log.c
+++ b/ui-log.c
@@ -167,6 +167,7 @@ static int show_commit(struct commit *commit, struct rev_info *revs)
 	revs->diffopt.output_format = DIFF_FORMAT_CALLBACK;
 	revs->diffopt.format_callback = cgit_diff_tree_cb;
 	revs->diffopt.format_callback_data = handle_rename;
+	revs->diffopt.no_free = 1;
 	diff_flush(&revs->diffopt);
 	revs->diffopt.output_format = saved_fmt;
 	revs->diffopt.flags = saved_flags;