t4204 is not sanitizer clean at all

Earlier we marked that this patch-id test is leak-sanitizer clean,
but if we read the test script carefully, it is merely because we
have too many invocations of commands in the "git log" family on the
upstream side of the pipe, hiding breakages from them.

Split the pipeline so that breakages from these commands can be
caught (not limited to aborts due to leak-sanitizer) and unmark
the script as not passing the test with leak-sanitizer in effect.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t4204-patch-id.sh

@@ -5,7 +5,6 @@ test_description='git patch-id'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
-TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -28,7 +27,8 @@ test_expect_success 'setup' '
 '
 
 test_expect_success 'patch-id output is well-formed' '
-	git log -p -1 | git patch-id >output &&
+	git log -p -1 >log.output &&
+	git patch-id <log.output >output &&
 	grep "^$OID_REGEX $(git rev-parse HEAD)$" output
 '
 
@@ -36,8 +36,8 @@ test_expect_success 'patch-id output is well-formed' '
 calc_patch_id () {
 	patch_name="$1"
 	shift
-	git patch-id "$@" |
+	git patch-id "$@" >patch-id.output &&
-	sed "s/ .*//" >patch-id_"$patch_name" &&
+	sed "s/ .*//" patch-id.output >patch-id_"$patch_name" &&
 	test_line_count -gt 0 patch-id_"$patch_name"
 }
 
@@ -46,7 +46,8 @@ get_top_diff () {
 }
 
 get_patch_id () {
-	get_top_diff "$1" | calc_patch_id "$@"
+	get_top_diff "$1" >top-diff.output &&
+	calc_patch_id <top-diff.output "$@"
 }
 
 test_expect_success 'patch-id detects equality' '
@@ -64,16 +65,18 @@ test_expect_success 'patch-id detects inequality' '
 test_expect_success 'patch-id supports git-format-patch output' '
 	get_patch_id main &&
 	git checkout same &&
-	git format-patch -1 --stdout | calc_patch_id same &&
+	git format-patch -1 --stdout >format-patch.output &&
+	calc_patch_id same <format-patch.output &&
 	test_cmp patch-id_main patch-id_same &&
-	set $(git format-patch -1 --stdout | git patch-id) &&
+	set $(git patch-id <format-patch.output) &&
 	test "$2" = $(git rev-parse HEAD)
 '
 
 test_expect_success 'whitespace is irrelevant in footer' '
 	get_patch_id main &&
 	git checkout same &&
-	git format-patch -1 --stdout | sed "s/ \$//" | calc_patch_id same &&
+	git format-patch -1 --stdout >format-patch.output &&
+	sed "s/ \$//" format-patch.output | calc_patch_id same &&
 	test_cmp patch-id_main patch-id_same
 '
 
@@ -92,10 +95,11 @@ test_patch_id_file_order () {
 	shift
 	name="order-${1}-$relevant"
 	shift
-	get_top_diff "main" | calc_patch_id "$name" "$@" &&
+	get_top_diff "main" >top-diff.output &&
+	calc_patch_id <top-diff.output "$name" "$@" &&
 	git checkout same &&
-	git format-patch -1 --stdout -O foo-then-bar |
+	git format-patch -1 --stdout -O foo-then-bar >format-patch.output &&
-		calc_patch_id "ordered-$name" "$@" &&
+	calc_patch_id <format-patch.output "ordered-$name" "$@" &&
 	cmp_patch_id $relevant "$name" "ordered-$name"
 
 }
@@ -143,7 +147,8 @@ test_expect_success '--stable overrides patchid.stable = false' '
 test_expect_success 'patch-id supports git-format-patch MIME output' '
 	get_patch_id main &&
 	git checkout same &&
-	git format-patch -1 --attach --stdout | calc_patch_id same &&
+	git format-patch -1 --attach --stdout >format-patch.output &&
+	calc_patch_id <format-patch.output same &&
 	test_cmp patch-id_main patch-id_same
 '