[PATCH 1/3] commit-graph tests: fix error-hiding graph_git_two_modes() helper

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

The graph_git_two_modes() helper added in 177722b3442 (commit:
integrate commit graph with commit parsing, 2018-04-10) didn't
&&-chain its "git commit-graph" invocations, which as can be seen with
SANITIZE=leak will happily mark tests as passing if both of these
commands die, since test_cmp() will be comparing two empty files.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 t/t5318-commit-graph.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh
index 295c5bd94d2..88fbe004a38 100755
--- a/t/t5318-commit-graph.sh
+++ b/t/t5318-commit-graph.sh
@@ -70,8 +70,8 @@ test_expect_success 'create commits and repack' '
 '
 
 graph_git_two_modes() {
-	git -c core.commitGraph=true $1 >output
-	git -c core.commitGraph=false $1 >expect
+	git -c core.commitGraph=true $1 >output &&
+	git -c core.commitGraph=false $1 >expect &&
 	test_cmp expect output
 }
 
-- 
2.33.1.1338.g20da966911a