Fixed some bad ptr occurrence in this class WndProc.
diff --git a/windows/mdi.c b/windows/mdi.c
index 0ece273..6cfe2bd 100644
--- a/windows/mdi.c
+++ b/windows/mdi.c
@@ -1021,16 +1021,23 @@
LRESULT WINAPI MDIClientWndProc( HWND hwnd, UINT message, WPARAM wParam,
LPARAM lParam )
{
- LPCREATESTRUCTA cs;
+ LPCREATESTRUCTA cs;
MDICLIENTINFO *ci;
RECT rect;
- WND *w = WIN_FindWndPtr(hwnd);
- WND *frameWnd = WIN_LockWndPtr(w->parent);
- INT nItems;
- LRESULT retvalue;
+ WND *w, *frameWnd;
+ INT nItems;
+ LRESULT retvalue;
- ci = (MDICLIENTINFO *) w->wExtra;
-
+ if ( ( w = WIN_FindWndPtr(hwnd) ) == NULL )
+ return 0;
+
+ if ( ( frameWnd = WIN_LockWndPtr(w->parent) ) == NULL ) {
+ WIN_ReleaseWndPtr(w);
+ return 0;
+ }
+
+ ci = (MDICLIENTINFO *) w->wExtra;
+
switch (message)
{
case WM_CREATE:
