ls-files: don't try to prune an empty index

diff --git a/builtin/log.c b/builtin/log.c
index 8ca1de98943bdc62248ddd31708a6632557c61de..c6362cf92ed799696128a5da6c802813db62fbcf 100644 (file)
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -1308,7 +1308,7 @@ static struct commit *get_base_commit(const char *base_commit,
 
                if (rev_nr % 2)
                        rev[i] = rev[2 * i];
-               rev_nr = (rev_nr + 1) / 2;
+               rev_nr = DIV_ROUND_UP(rev_nr, 2);
        }
 
        if (!in_merge_bases(base, rev[0]))