BIND 10 trac2092, updated. f57f421032d74e172f44efcd4e22d89d467a12ec [2092] Add comment about pointer dereference asked by reviewer

[BIND 10 source code commits]

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- Log -----------------------------------------------------------------
commit f57f421032d74e172f44efcd4e22d89d467a12ec
Author: Mukund Sivaraman <muks at isc.org>
Date:   Sun Jul 29 23:16:21 2012 +0530

    [2092] Add comment about pointer dereference asked by reviewer

-----------------------------------------------------------------------

Summary of changes:
 src/lib/datasrc/rbtree.h |    2 ++
 1 file changed, 2 insertions(+)

-----------------------------------------------------------------------
diff --git a/src/lib/datasrc/rbtree.h b/src/lib/datasrc/rbtree.h
index 7818747..b8cdfc6 100644
--- a/src/lib/datasrc/rbtree.h
+++ b/src/lib/datasrc/rbtree.h
@@ -1512,6 +1512,8 @@ RBTree<T>::insertRebalance(RBNode<T>** root, RBNode<T>* node) {
 
     RBNode<T>* uncle;
     while (node != *root && node->parent_->getColor() == RBNode<T>::RED) {
+        // Here, node->parent_ is not NULL and it is also red, so
+        // node->parent_->parent_ is also not NULL.
         if (node->parent_ == node->parent_->parent_->left_) {
             uncle = node->parent_->parent_->right_;