fixup! test-tool: add helper for name-hash values

This applies the patch at https://lore.kernel.org/git/ZvJj7PeB52m_1mG9@pks.im:

On Wed, Sep 18, 2024 at 08:46:21PM +0000, Derrick Stolee via GitGitGadget wrote:
> From: Derrick Stolee <stolee@gmail.com>
> diff --git a/t/helper/test-name-hash.c b/t/helper/test-name-hash.c
> new file mode 100644
> index 00000000000..15fb8f853c1
> --- /dev/null
> +++ b/t/helper/test-name-hash.c
> @@ -0,0 +1,23 @@
> +/*
> + * test-name-hash.c: Read a list of paths over stdin and report on their
> + * name-hash and full name-hash.
> + */
> +
> +#include "test-tool.h"
> +#include "git-compat-util.h"
> +#include "pack-objects.h"
> +#include "strbuf.h"
> +
> +int cmd__name_hash(int argc UNUSED, const char **argv UNUSED)
> +{
> +	struct strbuf line = STRBUF_INIT;
> +
> +	while (!strbuf_getline(&line, stdin)) {
> +		uint32_t name_hash = pack_name_hash(line.buf);
> +		uint32_t full_hash = pack_full_name_hash(line.buf);
> +
> +		printf("%10"PRIu32"\t%10"PRIu32"\t%s\n", name_hash, full_hash, line.buf);
> +	}
> +
> +	return 0;
> +}

This patch breaks t5310 with the leak sanitizer enabled due to the
leaking `struct strbuf line`. It needs the following diff on top:

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

t/helper/test-name-hash.c

@@ -19,5 +19,6 @@ int cmd__name_hash(int argc UNUSED, const char **argv UNUSED)
 		printf("%10"PRIu32"\t%10"PRIu32"\t%s\n", name_hash, full_hash, line.buf);
 	}
 
+	strbuf_release(&line);
 	return 0;
 }