[libgee] Fix typos in TreeMap and TreeSet fix and other embarrasing mistakes

[Maciej Marcin Piechotka <mpiechotka src gnome org>]

commit 37cacc4cfa8816a732f2cf684d78f81d2f6cb108
Author: Maciej Piechotka <uzytkownik2 gmail com>
Date:   Tue Aug 3 00:42:44 2010 +0200

    Fix typos in TreeMap and TreeSet fix and other embarrasing mistakes

 gee/treemap.vala |   13 ++++++++-----
 gee/treeset.vala |   11 +++++++----
 2 files changed, 15 insertions(+), 9 deletions(-)
---
diff --git a/gee/treemap.vala b/gee/treemap.vala
index 5b9d5bf..8b3917e 100644
--- a/gee/treemap.vala
+++ b/gee/treemap.vala
@@ -245,6 +245,8 @@ public class Gee.TreeMap<K,V> : Gee.AbstractMap<K,V> {
 		Node<K,V> n = (owned) node;
 		if (&key != null)
 			key = (owned) n.key;
+		else
+			n.key = null;
 		if (&value != null)
 			value = (owned) n.value;
 		if (n.prev != null) {
@@ -257,8 +259,7 @@ public class Gee.TreeMap<K,V> : Gee.AbstractMap<K,V> {
 		} else {
 			last = n.next;
 		}
-		node.key = null;
-		node.value = null;
+		n.value = null;
 		node = null;
 		_size--;
 	}
@@ -356,11 +357,13 @@ public class Gee.TreeMap<K,V> : Gee.AbstractMap<K,V> {
 		return b;
 	}
 
-	private inline void clear_subtree (owned Node<G> node) {
+	private inline void clear_subtree (owned Node<K,V> node) {
 		node.key = null;
 		node.value = null;
-		clear_subtree ((owned) node.left);
-		clear_subtree ((owned) node.right);
+		if (node.left != null)
+			clear_subtree ((owned) node.left);
+		if (node.right != null)
+			clear_subtree ((owned) node.right);
 	}
 
 	/**
diff --git a/gee/treeset.vala b/gee/treeset.vala
index 2ebe1f7..0f09ff9 100644
--- a/gee/treeset.vala
+++ b/gee/treeset.vala
@@ -214,6 +214,8 @@ public class Gee.TreeSet<G> : AbstractSet<G>, SortedSet<G> {
 		Node<G> n = (owned)node;
 		if (&key != null)
 			key = (owned) n.key;
+		else
+			n.key = null;
 		if (n.prev != null) {
 			n.prev.next = n.next;
 		} else {
@@ -224,7 +226,6 @@ public class Gee.TreeSet<G> : AbstractSet<G>, SortedSet<G> {
 		} else {
 			_last = n.prev;
 		}
-		node.key = null;
 		node = null;
 		_size--;
 	}
@@ -314,8 +315,10 @@ public class Gee.TreeSet<G> : AbstractSet<G>, SortedSet<G> {
 
 	private inline void clear_subtree (owned Node<G> node) {
 		node.key = null;
-		clear_subtree ((owned) node.left);
-		clear_subtree ((owned) node.right);
+		if (node.left != null)
+			clear_subtree ((owned) node.left);
+		if (node.right != null)
+			clear_subtree ((owned) node.right);
 	}
 
 	/**
@@ -324,7 +327,7 @@ public class Gee.TreeSet<G> : AbstractSet<G>, SortedSet<G> {
 	public override void clear () {
 		if (root != null) {
 			clear_subtree ((owned) root);
-			first = last = null;
+			_first = _last = null;
 		}
 		_size = 0;
 		stamp++;