drm/nv50/kms: fix pin refcnt leaks
drm/nv50/kms: fix pin refcnt leaks

Weren't critical previously, the buffers would go away anyway.  But with
recent changes to core drm/ttm lockdep will get pissed off now, so let's
fix it.

Reported-by: Maarten Lankhorst <743c2818a341d71b99ed2b566f9f80c2fc288f93@canonical.com>
Signed-off-by: Ben Skeggs <d9f27fb07c1e9f131223ad827fa5179f3846c30b@redhat.com>
Acked-by: Maarten Lankhorst <743c2818a341d71b99ed2b566f9f80c2fc288f93@canonical.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs