PVS-Studio warning V616 for Firefox

enum nsBorderStyle {
  eBorderStyle_none = 0,
  ....
};

NS_IMETHODIMP
nsWindow::SetNonClientMargins(nsIntMargin &margins)
{
  if (!mIsTopWidgetWindow ||
      mBorderStyle & eBorderStyle_none ||
      mHideChrome)
    return NS_ERROR_INVALID_ARG;
  ....
}

Most likely this is what should be written here: mBorderStyle != eBorderStyle_none

This suspicious code was found in Firefox project by PVS-Studio static code analyzer.
Warning message is:
V616 The 'eBorderStyle_none' named constant with the value of 0 is used in the bitwise operation. nswindow.cpp 2278

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/