PVS-Studio warning V547 for BCMenu

BCMenu *BCMenu::FindMenuOption(int nId,UINT& nLoc)
{
  ...
  nLoc = -1;
  ...
}

BOOL BCMenu::ModifyODMenuW(wchar_t *lpstrText,
                           UINT nID, int nIconNormal)
{
  UINT nLoc;
  ...
  BCMenu *psubmenu = FindMenuOption(nID,nLoc);
  ...
  if(psubmenu && nLoc>=0) mdata = psubmenu->m_MenuList[nLoc];
  ...
}

This suspicious code was found in BCMenu project by PVS-Studio static code analyzer.
Warning message is:
V547 Expression 'nLoc >= 0' is always true. Unsigned type value is always >= 0. Merge bcmenu.cpp 1232

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/