ambiguous overload for 'operator!=' issue

I am porting some ATL based headers into Mingw and came across problem with this code

    CComBSTR bstrHelpFile; 
        hr = pTypeLib->GetDocumentation(-1, NULL, NULL, NULL, &bstrHelpFile);

        if (SUCCEEDED(hr) && bstrHelpFile != NULL)
        {
           ..
        }

The error message that I get is this

C:\mingw64\opt\atlmfc\include/atlbase.h:5882:37: error: ambiguous overload for 'operator!=' (operand types are 'ATL::CComBSTR' and 'long long int')
   if (SUCCEEDED(hr) && bstrHelpFile != NULL)
                                     ^
C:\mingw64\opt\atlmfc\include/atlbase.h:5882:37: note: candidates are:
C:\mingw64\opt\atlmfc\include/atlbase.h:5882:37: note: operator!=(BSTR {aka wchar_t*}, BSTR {aka wchar_t*}) <built-in>

This is the code from the ATL header atlbase.h

Any suggestions on how I could resolve this issue ?