Fusion: Fix assertion in single app fusion_call_destroy().
Fusion: Fix assertion in single app fusion_call_destroy().

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