fix buffer count in IDirectFBSurface_WaitForBackBuffer()
fix buffer count in IDirectFBSurface_WaitForBackBuffer()

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