Fixed one lvalue casted assignment for the new compiler.

diff --git a/programs/wineconsole/curses.c b/programs/wineconsole/curses.c
index c5e365c..6e94320 100644
--- a/programs/wineconsole/curses.c
+++ b/programs/wineconsole/curses.c
@@ -858,7 +858,7 @@
 
     HeapFree(GetProcessHeap(), 0, PRIVATE(data)->line);
     HeapFree(GetProcessHeap(), 0, PRIVATE(data));
-    PRIVATE(data) = NULL;
+    data->private = NULL;
 }
 
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