[layers] Fixed warning in non-debug mode.
[layers] Fixed warning in non-debug mode.

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