t4023: fix ignored exit codes of git

Change a "git diff-tree" command to be &&-chained so that we won't
ignore its exit code, see the ea05fd5fbf (Merge branch
'ab/keep-git-exit-codes-in-tests', 2022-03-16) topic for prior art.

This fixes code added in b45563a229 (rename: Break filepairs with
different types., 2007-11-30). Due to hiding the exit code we hid a
memory leak under SANITIZE=leak.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t4023-diff-rename-typechange.sh

@@ -52,8 +52,8 @@ test_expect_success setup '
 '
 
 test_expect_success 'cross renames to be detected for regular files' '
-
-	git diff-tree five six -r --name-status -B -M | sort >actual &&
+	git diff-tree five six -r --name-status -B -M >out &&
+	sort out >actual &&
 	{
 		echo "R100	foo	bar" &&
 		echo "R100	bar	foo"
@@ -63,8 +63,8 @@ test_expect_success 'cross renames to be detected for regular files' '
 '
 
 test_expect_success 'cross renames to be detected for typechange' '
-
-	git diff-tree one two -r --name-status -B -M | sort >actual &&
+	git diff-tree one two -r --name-status -B -M >out &&
+	sort out >actual &&
 	{
 		echo "R100	foo	bar" &&
 		echo "R100	bar	foo"
@@ -74,8 +74,8 @@ test_expect_success 'cross renames to be detected for typechange' '
 '
 
 test_expect_success 'moves and renames' '
-
-	git diff-tree three four -r --name-status -B -M | sort >actual &&
+	git diff-tree three four -r --name-status -B -M >out &&
+	sort out >actual &&
 	{
 		# see -B -M (#6) in t4008
 		echo "C100	foo	bar" &&