grep: enable recurse-submodules to work on <tree> objects

diff --git a/t/t1430-bad-ref-name.sh b/t/t1430-bad-ref-name.sh
index 25ddab4e984877cb9361919a893fce391d2f066a..8937e25e4955b79d72952289e7485652309def3a 100755 (executable)
--- a/t/t1430-bad-ref-name.sh
+++ b/t/t1430-bad-ref-name.sh
@@ -285,7 +285,7 @@ test_expect_success 'update-ref -d cannot delete non-ref in .git dir' '
        echo precious >expect &&
        test_must_fail git update-ref -d my-private-file >output 2>error &&
        test_must_be_empty output &&
-       test_i18ngrep -e "cannot lock .*: unable to resolve reference" error &&
+       test_i18ngrep -e "refusing to update ref with bad name" error &&
        test_cmp expect .git/my-private-file
 '