fix warning
fix warning

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