shutdown: use direct_list_foreach_safe() in containers_remove_input_eventbuffer()
shutdown: use direct_list_foreach_safe() in containers_remove_input_eventbuffer()

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