headers: normalize the spelling of some header guards

diff --git a/t/t4116-apply-reverse.sh b/t/t4116-apply-reverse.sh
index ce8567f496438c18501f30632269ecbe7de15fd3..b99e65c086391276aeb809b8651507026509e19a 100755 (executable)
--- a/t/t4116-apply-reverse.sh
+++ b/t/t4116-apply-reverse.sh
@@ -42,7 +42,7 @@ test_expect_success 'apply in reverse' '
        git reset --hard second &&
        git apply --reverse --binary --index patch &&
        git diff >diff &&
-       test_cmp /dev/null diff
+       test_must_be_empty diff
 
 '