Resolves: tdf#121936 uninitialized value used

since...

commit e194f597
Date:   Sun Sep 30 16:07:16 2018 +0200

    Change GlyphItem::nFallbackLevel to font instance

Change-Id: I14b40a63cd48ef527e76e15af8f421ce48cce769
Reviewed-on: https://gerrit.libreoffice.org/64698Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/source/gdi/sallayout.cxx

@@ -892,7 +892,7 @@ sal_Int32 GenericSalLayout::GetTextBreak( DeviceCoordinate nMaxWidth, DeviceCoor
 
 bool GenericSalLayout::GetNextGlyph(const GlyphItem** pGlyph,
                                     Point& rPos, int& nStart,
-                                    const PhysicalFontFace**, int* const) const
+                                    const PhysicalFontFace**, int* const pFallbackLevel) const
 {
     std::vector<GlyphItem>::const_iterator pGlyphIter = m_GlyphItems.Impl()->begin();
     std::vector<GlyphItem>::const_iterator pGlyphIterEnd = m_GlyphItems.Impl()->end();
@@ -915,6 +915,8 @@ bool GenericSalLayout::GetNextGlyph(const GlyphItem** pGlyph,
 
     // update return data with glyph info
     *pGlyph = &(*pGlyphIter);
+    if (pFallbackLevel)
+        *pFallbackLevel = 0;
     ++nStart;
 
     // calculate absolute position in pixel units