commit-graph: fix a parse_options_concat() leak

When the parse_options_concat() was added to this file in
84e4484 (commit-graph: use parse_options_concat(), 2021-08-23) we
wouldn't free() it if we returned early in these cases.

Since "result" is 0 by default we can "goto cleanup" in both cases,
and only need to set "result" if write_commit_graph_reachable() fails.

Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: avar

builtin/commit-graph.c

@@ -269,8 +269,8 @@ static int graph_write(int argc, const char **argv, const char *prefix)
 
 	if (opts.reachable) {
 		if (write_commit_graph_reachable(odb, flags, &write_opts))
-			return 1;
-		return 0;
+			result = 1;
+		goto cleanup;
 	}
 
 	if (opts.stdin_packs) {