drmkms: fix drmkmsPlaneRemoveRegion()
drmkms: fix drmkmsPlaneRemoveRegion()

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