Zach Brown e5e7a25ecd Don't use null node when repairing aug
We were derefing the null parent when deleting a single node in a tree.
There's no need to use parent_ref() here, we know that there's no node
and we can just clear the root's aug bits.

Signed-off-by: Zach Brown <zab@versity.com>
2017-04-18 13:44:53 -07:00
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