fonts: Fix assertion because of missing cache assignment.
fonts: Fix assertion because of missing cache assignment.

kevleyski/directfb,kaostao/directfb,deniskropp/DirectFB,DirectFB/directfb,lancebaiyouview/DirectFB,kevleyski/directfb,sklnet/DirectFB,deniskropp/DirectFB,kevleyski/DirectFB-1,mtsekm/test,DirectFB/directfb,kevleyski/DirectFB-1,djbclark/directfb-core-DirectFB,lancebaiyouview/DirectFB,deniskropp/DirectFB,kevleyski/DirectFB-1,djbclark/directfb-core-DirectFB,sklnet/DirectFB,lancebaiyouview/DirectFB,kevleyski/DirectFB-1,DirectFB/directfb,dfbdok/DirectFB1,deniskropp/DirectFB,Distrotech/DirectFB,dfbdok/DirectFB1,mtsekm/test,kevleyski/directfb,mtsekm/test,Distrotech/DirectFB,djbclark/directfb-core-DirectFB,Distrotech/DirectFB,kaostao/directfb,lancebaiyouview/DirectFB,sklnet/DirectFB,kevleyski/directfb,kaostao/directfb,jcdubois/DirectFB,jcdubois/DirectFB,jcdubois/DirectFB,djbclark/directfb-core-DirectFB,dfbdok/DirectFB1,sklnet/DirectFB