Release allocated resources on error recovery path in function
iommu_init_domains().

Also improve printk messages in iommu_init_domains().
Acked-by: NYijing Wang <wangyijing@huawei.com>
Signed-off-by: NJiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: NJoerg Roedel <joro@8bytes.org>