X11: Fix OOM case in x11Lock() that left the mutex locked.
X11: Fix OOM case in x11Lock() that left the mutex locked.

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