[PATCH] The sun50i_iommu_of_xlate() function didn't properly handle the case where of_find_device_by_node() returns NULL. This could lead to a NULL pointer dereference when accessing platform_get_drvdata(iommu_pdev) if the device node couldn't be found.

[Joerg Roedel]

The subject line is too long, use something short which describes WHAT
the patch does. The WHY can be placed into the commit message.

Thanks,

	Joerg