check for row_width > 0 before modulo
check for row_width > 0 before modulo

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