get_ref_dir(): take the containing directory as argument

diff --git a/t/t4021-format-patch-numbered.sh b/t/t4021-format-patch-numbered.sh
index 709b3231ca8d9da631727b4aadfb2f46049d37e9..886494b58f6739d40c2c34724064317b0d3be770 100755 (executable)
--- a/t/t4021-format-patch-numbered.sh
+++ b/t/t4021-format-patch-numbered.sh
@@ -95,7 +95,7 @@ test_expect_success 'format.numbered && --keep-subject' '
 
 test_expect_success 'format.numbered = auto' '
 
-       git config format.numbered auto
+       git config format.numbered auto &&
        git format-patch --stdout HEAD~2 > patch5 &&
        test_numbered patch5