fixed small render bug in StretchBlit()
fixed small render bug in StretchBlit()

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