PVS-Studio warning V593 for Putty

static LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
  WPARAM wParam, LPARAM lParam)
{
  ....
  if ((rc = p_GetSecurityInfo(filemap, SE_KERNEL_OBJECT,
              OWNER_SECURITY_INFORMATION,
              &mapowner, NULL, NULL, NULL,
              &psd) != ERROR_SUCCESS))
  {
    #ifdef DEBUG_IPC
      debug(("couldn't get owner info for filemap: %d\n", rc));
    #endif
      CloseHandle(filemap);
      sfree(ourself);
      sfree(ourself2);
      return 0;
  }
  ....
}

A minor problem. The program prints the wrong value in debug mode.

This suspicious code was found in Putty project by PVS-Studio static code analyzer.
Warning message is:
V593 Consider reviewing the expression of the 'A = B != C' kind. The expression is calculated as following: 'A = (B != C)'. winpgnt.c 1937

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