coverity#1435548 rework to avoid Dereference after null check warning

Change-Id: Ifb0d6af999e4935009669a7f85a77e640ce0eddc
Reviewed-on: https://gerrit.libreoffice.org/54138Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/unx/generic/glyphs/freetype_glyphcache.cxx

@@ -333,23 +333,22 @@ void FreetypeManager::ClearFontList( )
 
 FreetypeFont* FreetypeManager::CreateFont( const FontSelectPattern& rFSD )
 {
-    FreetypeFontInfo* pFontInfo = nullptr;
-
     // find a FontInfo matching to the font id
-    sal_IntPtr nFontId = 0;
-    if (rFSD.mpFontInstance && rFSD.mpFontInstance->GetFontFace())
-        nFontId = rFSD.mpFontInstance->GetFontFace()->GetFontId();
+    if (!rFSD.mpFontInstance)
+        return nullptr;
 
+    const PhysicalFontFace* pFontFace = rFSD.mpFontInstance->GetFontFace();
+    if (!pFontFace)
+        return nullptr;
+
+    sal_IntPtr nFontId = pFontFace->GetFontId();
     FontList::iterator it = maFontList.find(nFontId);
-    if( it != maFontList.end() )
-        pFontInfo = it->second;
+    FreetypeFontInfo* pFontInfo = it != maFontList.end() ? it->second : nullptr;
 
-    if( !pFontInfo )
+    if (!pFontInfo)
         return nullptr;
 
-    FreetypeFont* pNew = new FreetypeFont( rFSD, pFontInfo );
-
-    return pNew;
+    return new FreetypeFont(rFSD, pFontInfo);
 }
 
 FreetypeFontFace::FreetypeFontFace( FreetypeFontInfo* pFI, const FontAttributes& rDFA )