[patch] drm/nouveau/platform: checking for IS_ERR() instead of NULL

[Thierry Reding]

On Tue, Apr 21, 2015 at 12:25:07PM +0300, Dan Carpenter wrote:
> iommu_domain_alloc() returns NULL on error, it doesn't return error
> pointers.
> 
> Fixes: 58fd9375c2c5 ('drm/nouveau/platform: probe IOMMU if present')
> Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

Indeed:

Reviewed-by: Thierry Reding <treding at nvidia.com>
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