t/helper: fix leaking multi-pack-indices in "read-midx"

Several of the subcommands of `test-helper read-midx` do not close the
MIDX that they have opened, leading to memory leaks. Fix those.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: pks-t

t/helper/test-read-midx.c

@@ -86,6 +86,8 @@ static int read_midx_checksum(const char *object_dir)
 	if (!m)
 		return 1;
 	printf("%s\n", hash_to_hex(get_midx_checksum(m)));
+
+	close_midx(m);
 	return 0;
 }
 
@@ -102,10 +104,12 @@ static int read_midx_preferred_pack(const char *object_dir)
 
 	if (midx_preferred_pack(midx, &preferred_pack) < 0) {
 		warning(_("could not determine MIDX preferred pack"));
+		close_midx(midx);
 		return 1;
 	}
 
 	printf("%s\n", midx->pack_names[preferred_pack]);
+	close_midx(midx);
 	return 0;
 }
 
@@ -122,8 +126,10 @@ static int read_midx_bitmapped_packs(const char *object_dir)
 		return 1;
 
 	for (i = 0; i < midx->num_packs + midx->num_packs_in_base; i++) {
-		if (nth_bitmapped_pack(the_repository, midx, &pack, i) < 0)
+		if (nth_bitmapped_pack(the_repository, midx, &pack, i) < 0) {
+			close_midx(midx);
 			return 1;
+		}
 
 		printf("%s\n", pack_basename(pack.p));
 		printf("  bitmap_pos: %"PRIuMAX"\n", (uintmax_t)pack.bitmap_pos);

t/t5319-multi-pack-index.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='multi-pack-indexes'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-chunk.sh
 . "$TEST_DIRECTORY"/lib-midx.sh

t/t7704-repack-cruft.sh

@@ -2,6 +2,7 @@
 
 test_description='git repack works correctly'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 objdir=.git/objects