Fix warning about wrong number scheme on some 64bit platforms

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4443 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CNullDriver.h

@@ -742,7 +742,7 @@ namespace video
 
 		struct SOccQuery
 		{
-			SOccQuery(scene::ISceneNode* node, const scene::IMesh* mesh=0) : Node(node), Mesh(mesh), PID(0), Result(~0), Run(~0)
+			SOccQuery(scene::ISceneNode* node, const scene::IMesh* mesh=0) : Node(node), Mesh(mesh), PID(0), Result(0xffffffff), Run(0xffffffff)
 			{
 				if (Node)
 					Node->grab();