fftester: isAsciiLowerCase has a isUnicodeCodePoint assert

which is not helpful when the data is incoming from the outside
world

Change-Id: I00304ed0d577944a33f5fa6af155f1d130ab7d59
diff --git a/writerfilter/source/rtftok/rtftokenizer.cxx b/writerfilter/source/rtftok/rtftokenizer.cxx
index 8ca7433..5727b14 100644
--- a/writerfilter/source/rtftok/rtftokenizer.cxx
+++ b/writerfilter/source/rtftok/rtftokenizer.cxx
@@ -170,24 +170,17 @@ int RTFTokenizer::asHex(char ch)
        ret = ch - '0';
    else
    {
        if (rtl::isAsciiLowerCase(ch))
        {
            if (ch < 'a' || ch > 'f')
                return -1;
        if (ch >= 'a' && ch <= 'f')
            ret = ch - 'a';
        }
        else
        {
            if (ch < 'A' || ch > 'F')
                return -1;
        else if (ch >= 'A' && ch <= 'F')
            ret = ch - 'A';
        }
        else
            return -1;
        ret += 10;
    }
    return ret;
}


void RTFTokenizer::pushGroup()
{
    m_nGroup++;