Core: Fix warnings
Core: Fix warnings

deniskropp/DirectFB,sklnet/DirectFB,djbclark/directfb-core-DirectFB,djbclark/directfb-core-DirectFB,lancebaiyouview/DirectFB,sklnet/DirectFB,djbclark/directfb-core-DirectFB,deniskropp/DirectFB,sklnet/DirectFB,deniskropp/DirectFB,lancebaiyouview/DirectFB,lancebaiyouview/DirectFB,lancebaiyouview/DirectFB,djbclark/directfb-core-DirectFB,deniskropp/DirectFB,jcdubois/DirectFB,jcdubois/DirectFB,jcdubois/DirectFB,sklnet/DirectFB