PVS-Studio warning V514 for Notepad++

typedef struct tagTVITEMA {
  ...
  LPSTR     pszText;
  ...
} TVITEMA, *LPTVITEMA;

#define TVITEM TVITEMA

HTREEITEM TreeView::addItem(....)
{
  TVITEM tvi;
  ...
  tvi.cchTextMax = sizeof(tvi.pszText)/sizeof(tvi.pszText[0]);
  ...
}

This suspicious code was found in Notepad++ project by PVS-Studio static code analyzer.
Warning message is:
V514 Dividing sizeof a pointer 'sizeof (tvi.pszText)' by another value. There is a probability of logical error presence.  Notepad++  treeview.cpp  88

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/