fix [#32743] Freed memory access when freeing materials.

source/blender/blenkernel/intern/node.c

@@ -1030,9 +1030,18 @@ void ntreeFreeTree_ex(bNodeTree *ntree, const short do_id_user)
 		next = node->next;
 
 		/* ntreeUserIncrefID inline */
+
+		/* XXX, this is correct, however when freeing the entire database
+		 * this ends up accessing freed data which isn't properly unlinking
+		 * its self from scene nodes, SO - for now prefer invalid usercounts
+		 * on free rather then bad memory access - Campbell */
+#if 0
 		if (do_id_user) {
 			id_us_min(node->id);
 		}
+#else
+		(void)do_id_user;
+#endif
 
 		nodeFreeNode(ntree, node);
 	}
@@ -1047,15 +1056,7 @@ void ntreeFreeTree_ex(bNodeTree *ntree, const short do_id_user)
 /* same as ntreeFreeTree_ex but always manage users */
 void ntreeFreeTree(bNodeTree *ntree)
 {
-	/* XXX, this is correct, however when freeing the entire database
-	 * this ends up accessing freed data which isn't properly unlinking
-	 * its self from scene nodes, SO - for now prefer invalid usercounts
-	 * on free rather then bad memory access - Campbell */
-#if 0
 	ntreeFreeTree_ex(ntree, TRUE);
-#else
-	ntreeFreeTree_ex(ntree, FALSE);
-#endif
 }
 
 void ntreeFreeCache(bNodeTree *ntree)