nfs_idmap_cache_destroy
static void nfs_idmap_cache_destroy(idmap_cache_info_t *);
nfs_idmap_cache_destroy(&nig->u2s_ci);
nfs_idmap_cache_destroy(&nig->s2u_ci);
nfs_idmap_cache_destroy(&nig->g2s_ci);
nfs_idmap_cache_destroy(&nig->s2g_ci);