Make sure we null the display private, make sure we catch and
handle vblank failing to init and don't call vblank_cleanup if
we haven't initialized the display system.
Signed-off-by: NJakob Bornecrantz <jakob@vmware.com>
Signed-off-by: NThomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>