SPLAY_REMOVE
SPLAY_REMOVE(splay_out, &la->linkSplayOut, lnk);
SPLAY_REMOVE(splay_out, &la->linkSplayOut, lnk);
SPLAY_REMOVE(splay_internal_endpoint,
SPLAY_REMOVE(splay_in, &la->linkSplayIn, grp);
ATF_CHECK_EQ(tmp, SPLAY_REMOVE(tree, &root, tmp));
ATF_CHECK_EQ(tmp, SPLAY_REMOVE(tree, &root, tmp));