ls-remote: release memory instead of UNLEAK

Use ref_array_clear() to release memory instead of UNLEAK macros.

Signed-off-by: Olga Telezhnaia <olyatelezhnaya@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/ls-remote.c

@@ -151,6 +151,6 @@ int cmd_ls_remote(int argc, const char **argv, const char *prefix)
 	}
 
 	UNLEAK(sorting);
-	UNLEAK(ref_array);
+	ref_array_clear(&ref_array);
 	return status;
 }