[PATCH 6/6] log tests: don't use "exit 1" outside a sub-shell

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

Change an "exit 1" added in ac52d9410e5 (t4205: cover `git log
--reflog -z` blindspot, 2019-11-19) to use "return 1" instead, which
curiously was done in an adjacent test case added in the same commit.

Using "exit 1" outside a sub-shell will cause the test framework
itself to exit on failure, which isn't what we want to do here.

This issue was spotted with the in-flight
"GIT_TEST_PASSING_SANITIZE_LEAK=check" test mode[1]. This "git show"
invocation currently leaks memory, and we'd thus "exit 1". This change
was initially part of that topic[2] to demonstrate the correctness of
the "check" implementation.

1. https://lore.kernel.org/git/patch-07.10-0961df2ab6c-20220719T205710Z-avarab@gmail.com/
2. https://lore.kernel.org/git/patch-10.10-9cedf0cb0e2-20220719T205710Z-avarab@gmail.com/

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 t/t4205-log-pretty-formats.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/t4205-log-pretty-formats.sh b/t/t4205-log-pretty-formats.sh
index e448ef2928a..0404491d6ee 100755
--- a/t/t4205-log-pretty-formats.sh
+++ b/t/t4205-log-pretty-formats.sh
@@ -156,7 +156,7 @@ test_expect_success 'NUL termination with --reflog --pretty=oneline' '
 	for r in $revs
 	do
 		git show -s --pretty=oneline "$r" >raw &&
-		cat raw | lf_to_nul || exit 1
+		cat raw | lf_to_nul || return 1
 	done >expect &&
 	# the trailing NUL is already produced so we do not need to
 	# output another one
-- 
2.37.1.1095.g64a1e8362fd