IDirectFBInputBuffer: Fix dead lock during Release.
IDirectFBInputBuffer: Fix dead lock during Release.

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