silence warning

Change-Id: I22e37ed4be19a39c061015f81938ab2d854db9b5
Reviewed-on: https://gerrit.libreoffice.org/45042Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/source/outdev/font.cxx

@@ -867,7 +867,7 @@ vcl::Font OutputDevice::GetDefaultFont( DefaultFontType nType, LanguageType eLan
             {
                 if( !pOutDev )
                 {
-                    SAL_WARN ("vcl.gdi", "No default window has been set for the application - we really shouldn't be able to get here");
+                    SAL_WARN_IF(!utl::ConfigManager::IsFuzzing(), "vcl.gdi", "No default window has been set for the application - we really shouldn't be able to get here");
                     sal_Int32 nIndex = 0;
                     aFont.SetFamilyName( aSearch.getToken( 0, ';', nIndex ) );
                 }