[gxml] HashThreeMap: Fix get() implementation

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit c3ec8b7bd66655034c744d4b9a0e7eb6414b3843
Author: Daniel Espinosa <esodan gmail com>
Date:   Thu Jul 11 13:46:48 2019 -0500

    HashThreeMap: Fix get() implementation

 gxml/HashThreeMap.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gxml/HashThreeMap.vala b/gxml/HashThreeMap.vala
index 2c88294..d661a82 100644
--- a/gxml/HashThreeMap.vala
+++ b/gxml/HashThreeMap.vala
@@ -152,7 +152,7 @@ public class GXml.HashThreeMap : GXml.BaseCollection, ThreeMap {
     var hte = ht.get (secondary_key);
     if (hte == null) return null;
     if (!hte.has_key (third_key)) return null;
-    var i = hte.get (secondary_key);
+    var i = hte.get (third_key);
     return _element.child_nodes.get (i) as DomElement;
   }
   /**