archive.c: convert to use struct object_id

diff --git a/refs.c b/refs.c
index ed3b2cb405cc576f16e5b94d83683953b94e1e89..9edf18b04e7e29b12fa3808aab2239efcc404dca 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -1618,8 +1618,7 @@ const char *resolve_ref_unsafe(const char *refname, int resolve_flags, unsigned
 
 char *resolve_refdup(const char *ref, int resolve_flags, unsigned char *sha1, int *flags)
 {
-       const char *ret = resolve_ref_unsafe(ref, resolve_flags, sha1, flags);
-       return ret ? xstrdup(ret) : NULL;
+       return xstrdup_or_null(resolve_ref_unsafe(ref, resolve_flags, sha1, flags));
 }
 
 /* The argument to filter_refs */