John Keeping aa1ac27f48 drm/rockchip: remove redundant statement
The call to arm_iommu_detach_device() on the previous line sets
dev->archdata.mapping to NULL so this call is always a no-op.

Signed-off-by: John Keeping <john@metanate.com>
2016-05-03 14:11:22 +08:00
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