drm/nouveau: fix semaphore dmabuf obj
Fixes some dmabuf object errors on nv50 chipset and below. Cc: stable@vger.kernel.org [3.7+] Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@canonical.com> Signed-off-by: NBen Skeggs <bskeggs@redhat.com>
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