drm/vmwgfx: Fix kernel NULL pointer dereference on older hardware
The commit "drm/vmwgfx: Fix up user_dmabuf refcounting", while fixing a kernel crash introduced a NULL pointer dereference on older hardware. Fix this. Cc: <stable@vger.kernel.org> Signed-off-by: NThomas Hellstrom <thellstrom@vmware.com> Reviewed-by: NSinclair Yeh <syeh@vmware.com> Reviewed-by: NBrian Paul <brianp@vmware.com>
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