Index: src/ch/DirTreeCtrl.cpp
===================================================================
diff -u -N -r4fe995b304ea342b50293f92d3c1992b43b820f7 -r8068e0c351055554340ac9755d1bc846893bf2b8
--- src/ch/DirTreeCtrl.cpp	(.../DirTreeCtrl.cpp)	(revision 4fe995b304ea342b50293f92d3c1992b43b820f7)
+++ src/ch/DirTreeCtrl.cpp	(.../DirTreeCtrl.cpp)	(revision 8068e0c351055554340ac9755d1bc846893bf2b8)
@@ -312,7 +312,7 @@
 // compares two items
 int CALLBACK CompareFunc(LPARAM lParam1, LPARAM lParam2, LPARAM/* lParamSort*/)
 {
-	if (lParam1 == NULL || lParam2 == NULL)
+	if (lParam1 == 0 || lParam2 == 0)
 		return 0;
 
 	SHELLITEMDATA* psidl1=(SHELLITEMDATA*)lParam1, *psidl2=(SHELLITEMDATA*)lParam2;
@@ -434,7 +434,7 @@
 			TVSORTCB tvscb = { 0 };
 			tvscb.hParent=hParent;
 			tvscb.lpfnCompare=&CompareFunc;
-			tvscb.lParam = NULL;
+			tvscb.lParam = 0;
 			if (!SortChildrenCB(&tvscb))
 				TRACE("SortChildren failed\n");
 		}
@@ -816,7 +816,7 @@
 	tvis.item.iSelectedImage=-1;
 	tvis.item.pszText=pszPath;
 	tvis.item.cchTextMax=lstrlen(tvis.item.pszText);
-	tvis.item.lParam = NULL;
+	tvis.item.lParam = 0;
 
 	HTREEITEM hRes=InsertItem(&tvis);