Merge branch 'ar/clean-rmdir-empty' into maint

* ar/clean-rmdir-empty:
  clean: unreadable directory may still be rmdir-able if it is empty

t/t7300-clean.sh

@@ -453,4 +453,11 @@ test_expect_success 'git clean -e' '
 	)
 '
 
+test_expect_success SANITY 'git clean -d with an unreadable empty directory' '
+	mkdir foo &&
+	chmod a= foo &&
+	git clean -dfx foo &&
+	! test -d foo
+'
+
 test_done