test-tool test-hash: fix a memory leak

Fix a memory leak in "test-tool test-hash" which has been there since
b57cbbf8a8 (test-sha1: test hashing large buffer, 2006-06-24), as a
result we can mark more tests as passing with SANITIZE=leak using
"TEST_PASSES_SANITIZE_LEAK=true".

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

t/helper/test-hash.c

@@ -54,5 +54,6 @@ int cmd_hash_impl(int ac, const char **av, int algo)
 		fwrite(hash, 1, algop->rawsz, stdout);
 	else
 		puts(hash_to_hex_algop(hash, algop));
+	free(buffer);
 	return 0;
 }

t/t0015-hash.sh

@@ -1,8 +1,9 @@
 #!/bin/sh
 
 test_description='test basic hash implementation'
-. ./test-lib.sh
 
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
 
 test_expect_success 'test basic SHA-1 hash values' '
 	test-tool sha1 </dev/null >actual &&

t/t5308-pack-detect-duplicates.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='handling of duplicate objects in incoming packfiles'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-pack.sh
 

t/t5309-pack-delta-cycles.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test index-pack handling of delta cycles in packfiles'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-pack.sh
 

t/t5321-pack-large-objects.sh

@@ -6,6 +6,8 @@
 test_description='git pack-object with "large" deltas
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-pack.sh