replay: die if we cannot parse object

`parse_object` can return `NULL`. That will in turn make
`repo_peel_to_type` return the same.

Let’s die fast and descriptively with the `*_or_die` variant.

Suggested-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: LemmingAvalanche

builtin/replay.c

@@ -42,7 +42,7 @@ static struct commit *peel_committish(struct repository *repo,
 
 	if (repo_get_oid(repo, name, &oid))
 		die(_("'%s' is not a valid commit-ish for %s"), name, mode);
-	obj = parse_object(repo, &oid);
+	obj = parse_object_or_die(repo, &oid, name);
 	return (struct commit *)repo_peel_to_type(repo, name, 0, obj,
 						  OBJ_COMMIT);
 }