Handle driver's functions return value.
Handle driver's functions return value.

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