t6120: clean up state after breaking repo

t6120 breaks the repo state intentionally in the last tests.

Clean up the breakage afterwards (and before adding more tests).

Signed-off-by: Michael J Gruber <git@grubix.eu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t6120-describe.sh

@@ -275,6 +275,7 @@ test_expect_success 'describe chokes on severely broken submodules' '
 '
 test_expect_success 'describe ignoring a borken submodule' '
 	git describe --broken >out &&
+	test_when_finished "mv .git/modules/sub_moved .git/modules/sub1" &&
 	grep broken out
 '