Don't assume WM_DESTROY is last message - listview sends notification after it. Confirmed in Windows 7.

See issue #6026 for more details.

svn path=/trunk/; revision=51105

reactos/dll/win32/devmgr/hwpage.c

@@ -964,6 +964,9 @@ HardwareDlgProc(IN HWND hwndDlg,
 
             case WM_DESTROY:
             {
+            	/* zero hpd pointer in window data, because it can be used later (WM_DESTROY has not to be last message) */
+            	SetWindowLongPtr(hwndDlg, DWL_USER, (DWORD_PTR)NULL);
+                
                 /* free devices list */
                 FreeDevicesList(hpd);