dfbdump: don't use dfb_surface_get_buffer() in alloc_callback()
dfbdump: don't use dfb_surface_get_buffer() in alloc_callback()

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