tree-diff: don't access hash of NULL object_id pointer

diff --git a/bisect.c b/bisect.c
index 08c9fb7266c3b2ff8b970c21d350be4adfe7b0fc..d88f9bc3dc1f78535b8a801c7f123340bb9c161a 100644 (file)
--- a/bisect.c
+++ b/bisect.c
@@ -546,7 +546,7 @@ static unsigned get_prn(unsigned count) {
 
 /*
  * Custom integer square root from
- * http://en.wikipedia.org/wiki/Integer_square_root
+ * https://en.wikipedia.org/wiki/Integer_square_root
  */
 static int sqrti(int val)
 {
@@ -705,7 +705,7 @@ static int bisect_checkout(const unsigned char *bisect_rev, int no_checkout)
 
 static struct commit *get_commit_reference(const struct object_id *oid)
 {
-       struct commit *r = lookup_commit_reference(oid->hash);
+       struct commit *r = lookup_commit_reference(oid);
        if (!r)
                die(_("Not a valid commit name %s"), oid_to_hex(oid));
        return r;