test-tool bloom: fix memory leaks

Fix memory leaks introduced with these tests in f1294eaf7f (bloom.c:
introduce core Bloom filter constructs, 2020-03-30), as a result we
can mark almost the entirety of t0095-bloom.sh as passing with
SANITIZE=leak using "TEST_PASSES_SANITIZE_LEAK=true", there's still an
unrelated memory leak in "git commit" in one of the tests, let's skip
that one under SANITIZE_LEAK for now.

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

t/helper/test-bloom.c

@@ -16,6 +16,7 @@ static void add_string_to_filter(const char *data, struct bloom_filter *filter)
 		}
 		printf("\n");
 		add_key_to_filter(&key, filter, &settings);
+		clear_bloom_key(&key);
 }
 
 static void print_bloom_filter(struct bloom_filter *filter) {
@@ -80,6 +81,7 @@ int cmd__bloom(int argc, const char **argv)
 		}
 
 		print_bloom_filter(&filter);
+		free(filter.data);
 	}
 
 	if (!strcmp(argv[1], "get_filter_for_commit")) {

t/t0095-bloom.sh

@@ -67,7 +67,7 @@ test_expect_success 'compute bloom key for test string 2' '
 	test_cmp expect actual
 '
 
-test_expect_success 'get bloom filters for commit with no changes' '
+test_expect_success !SANITIZE_LEAK 'get bloom filters for commit with no changes' '
 	git init &&
 	git commit --allow-empty -m "c0" &&
 	cat >expect <<-\EOF &&