From 4f3855997c5d2bf6443853800eb1a03f61ad9140 Mon Sep 17 00:00:00 2001
From: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Date: Sun, 7 Jul 2013 10:37:35 +0200
Subject: [PATCH] drm/nouveau: do not unpin in nouveau_gem_object_del

This should no longer be required, and is harmful for framebuffer pinning.
Also add a warning if unpin causes the pin count to drop below 0.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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