use strbuf_addstr() for adding strings to strbufs

diff --git a/refs/packed-backend.c b/refs/packed-backend.c
index 3bc47ffd5ea4e82f2505a8649b162d18ebf11a21..2951514f251bcb9274932789a0535caefbf03c2d 100644 (file)
--- a/refs/packed-backend.c
+++ b/refs/packed-backend.c
@@ -729,8 +729,8 @@ static int write_with_updates(struct packed_ref_store *refs,
        }
 
        if (ok != ITER_DONE) {
-               strbuf_addf(err, "unable to write packed-refs file: "
-                           "error iterating over old contents");
+               strbuf_addstr(err, "unable to write packed-refs file: "
+                             "error iterating over old contents");
                goto error;
        }