ofz#8185 Undefined-shift

Change-Id: I818ee989774da1499b1e6ac92b47bd09aedec754
Reviewed-on: https://gerrit.libreoffice.org/53992Tested-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

@@ -82,7 +82,7 @@ inline
 size_t GlyphCache::IFSD_Hash::operator()( const FontSelectPattern& rFontSelData ) const
 {
     // TODO: is it worth to improve this hash function?
-    sal_IntPtr nFontId = GetFontId(rFontSelData);
+    sal_uIntPtr nFontId = GetFontId(rFontSelData);
 
     if (rFontSelData.maTargetName.indexOf(FontSelectPatternAttributes::FEAT_PREFIX)
         != -1)