If pctrie_lookup_iter_ge fails to return a node, the iterator is left with NULL as the current node. Instead, make the pctrie_root the current node when the pctrie has an internalnode. Do the same thing for lookup_iter_le. If an iterator is reused after a ge/le lookup fails, this will skip the step in _pctrie_lookup_node where a NULL is replaced by the node at the top of the trie. Reviewed by: alc Differential Revision: https://reviews.freebsd.org/D51232