strcmp_null
if (strcmp_null(fsc->mount_options->mon_addr, fsopt->mon_addr)) {
ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
ret = strcmp_null(fsopt1->mon_addr, fsopt2->mon_addr);
ret = strcmp_null(opt1->name, opt2->name);