builtin/rev-parse: fix memory leak with --parseopt

The `--parseopt` mode allows shell scripts to have the same option
parsing mode as we have in C builtins. It soaks up a set of option
descriptions via stdin and massages them into proper `struct option`s
that we can then use to parse a set of arguments.

We only partially free those options when done though, creating a memory
leak. Interestingly, we only end up free'ing the first option's help,
which is of course wrong.

Fix this by freeing all option's help fields as well as their `argh`
fields to plug this memory leak.

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

builtin/rev-parse.c

@@ -553,7 +553,10 @@ static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 	strbuf_release(&sb);
 	strvec_clear(&longnames);
 	strvec_clear(&usage);
-	free((char *) opts->help);
+	for (size_t i = 0; i < opts_nr; i++) {
+		free((char *) opts[i].help);
+		free((char *) opts[i].argh);
+	}
 	free(opts);
 	return 0;
 }

t/t1502-rev-parse-parseopt.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test git rev-parse --parseopt'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 check_invalid_long_option () {