Added some assertions to dfb_gfxcard_blit() checking for a properly clipped source rectangle.
Added some assertions to dfb_gfxcard_blit()
checking for a properly clipped source rectangle.

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