t1700-split-index: drop unnecessary 'grep'

diff --git a/t/t3308-notes-merge.sh b/t/t3308-notes-merge.sh
index ab946a5153c041de92bde52aed4d47c2a0d80b21..d60588ec8f0038e43d6327537240512afc832c4c 100755 (executable)
--- a/t/t3308-notes-merge.sh
+++ b/t/t3308-notes-merge.sh
@@ -183,7 +183,7 @@ test_expect_success 'merge empty notes ref (z => y)' '
        git notes add -m "foo" &&
        git notes remove &&
        git notes >output_notes_z &&
-       test_cmp /dev/null output_notes_z &&
+       test_must_be_empty output_notes_z &&
        # Do the merge (z => y)
        git config core.notesRef refs/notes/y &&
        git notes merge z &&