Revert "Blind attempt to fix UBSAN error in FreetypeFont"

to see if this is still a problem after 'fix dubious cache comparison check'

This reverts commit b0be0d41.

Change-Id: I253a67c3aa5f8daf0e8cd586a5089e554e48f355
Reviewed-on: https://gerrit.libreoffice.org/55185Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/unx/generic/glyphs/glyphcache.cxx

@@ -357,11 +357,18 @@ void FreetypeFontInstance::SetFreetypeFont(FreetypeFont* p)
 {
     if (p == mpFreetypeFont)
         return;
+    if (mpFreetypeFont)
+        mpFreetypeFont->Release();
     mpFreetypeFont = p;
+    if (mpFreetypeFont)
+        mpFreetypeFont->AddRef();
 }
 
 FreetypeFontInstance::~FreetypeFontInstance()
 {
+    // TODO: remove the FreetypeFont here instead of in the GlyphCache
+    if (mpFreetypeFont)
+        mpFreetypeFont->Release();
 }
 
 static hb_blob_t* getFontTable(hb_face_t* /*face*/, hb_tag_t nTableTag, void* pUserData)