Core: Add assertions for buffer in dfb_surface_allocation_update().
Core: Add assertions for buffer in dfb_surface_allocation_update().

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