t7411: be nicer to future tests and really clean things up

Tests 5 and 7 in t/t7411-submodule-config.sh add two commits with
invalid lines in .gitmodules but then only the second commit is removed.

This may affect future subsequent tests if they assume that the
.gitmodules file has no errors.

Remove both the commits as soon as they are not needed anymore.

Signed-off-by: Antonio Ospite <ao2@ao2.it>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/t7411-submodule-config.sh b/t/t7411-submodule-config.sh
index f2cd1f4..b1f3c64 100755
--- a/t/t7411-submodule-config.sh
+++ b/t/t7411-submodule-config.sh
@@ -83,6 +83,8 @@
 EOF
 
 test_expect_success 'error in history of one submodule config lets continue, stderr message contains blob ref' '
+	ORIG=$(git -C super rev-parse HEAD) &&
+	test_when_finished "git -C super reset --hard $ORIG" &&
 	(cd super &&
 		cp .gitmodules .gitmodules.bak &&
 		echo "	value = \"" >>.gitmodules &&
@@ -115,6 +117,8 @@
 '
 
 test_expect_success 'error in history in fetchrecursesubmodule lets continue' '
+	ORIG=$(git -C super rev-parse HEAD) &&
+	test_when_finished "git -C super reset --hard $ORIG" &&
 	(cd super &&
 		git config -f .gitmodules \
 			submodule.submodule.fetchrecursesubmodules blabla &&
@@ -126,8 +130,7 @@
 			HEAD b \
 			HEAD submodule \
 				>actual &&
-		test_cmp expect_error actual  &&
-		git reset --hard HEAD^
+		test_cmp expect_error actual
 	)
 '