tdf#148505 Fix COL_AUTO in embedded Math formulas

Change-Id: I8be0289100cbd0921bcb05ffec186155abba8743
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/143575
Tested-by: Jenkins
Tested-by: Heiko Tietze <heiko.tietze@documentfoundation.org>
Reviewed-by: Heiko Tietze <heiko.tietze@documentfoundation.org>
(cherry picked from commit 12732eb7c34baa3f846ec6d0c10f8987051ace34)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/143588
Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>
diff --git a/starmath/source/tmpdevice.cxx b/starmath/source/tmpdevice.cxx
index 5eee10d..fccb20f 100644
--- a/starmath/source/tmpdevice.cxx
+++ b/starmath/source/tmpdevice.cxx
@@ -49,7 +49,8 @@ Color SmTmpDevice::GetTextColor(const Color& rTextColor)
    if (rTextColor == COL_AUTO)
    {
        Color aConfigFontColor = SM_MOD()->GetColorConfig().GetColorValue(svtools::FONTCOLOR).nColor;
        return rOutDev.GetReadableFontColor(aConfigFontColor, rOutDev.GetBackgroundColor());
        Color aConfigDocColor = SM_MOD()->GetColorConfig().GetColorValue(svtools::DOCCOLOR).nColor;
        return rOutDev.GetReadableFontColor(aConfigFontColor, aConfigDocColor);
    }

    return rTextColor;