The code in rn_walktree_from() that checks if we backed up too far did not stop at the right node. Change the backtracking check from smaller-than to smaller-or-equal to prevent this from happening. While here fix one additional problem where the insertion of the default route traversed the entire tree.
The code in rn_walktree_from() that checks if we backed up too far
did not stop at the right node. Change the backtracking check from
smaller-than to smaller-or-equal to prevent this from happening.
While here fix one additional problem where the insertion of the
default route traversed the entire tree.

PR:		kern/38752
Submitted by:	qingli (before I became committer)
Reviewed by:	andre
MFC after:	3 days

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