Well, it's a very basic-123 coding style, however, even in MS, it happens.
The code review seems not doing well.

Environment: VC6

File:
...\MFC\SRC\DLGFILE.CPP

Code: Line 113

...
if (nResult)
ASSERT(pThreadState->m_pAlternateWndInit == NULL);
pThreadState->m_pAlternateWndInit = NULL;
...

Of course, everyone here knows how to write this code.
Whatever...