iommu/vt-d: No need to typecast

Page directory assignment by alloc_pgtable_page() or phys_to_virt()
doesn't need typecasting as both routines return void*. Hence, remove
typecasting from both the calls.
Signed-off-by: NParav Pandit <parav@nvidia.com>
Signed-off-by: NLu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20210530075053.264218-1-parav@nvidia.com
Link: https://lore.kernel.org/r/20210610020115.1637656-24-baolu.lu@linux.intel.comSigned-off-by: NJoerg Roedel <jroedel@suse.de>

drivers/iommu/intel/iommu.c

@@ -4506,7 +4506,7 @@ static int md_domain_init(struct dmar_domain *domain, int guest_width)
 	domain->max_addr = 0;
 
 	/* always allocate the top pgd */
-	domain->pgd = (struct dma_pte *)alloc_pgtable_page(domain->nid);
+	domain->pgd = alloc_pgtable_page(domain->nid);
 	if (!domain->pgd)
 		return -ENOMEM;
 	domain_flush_cache(domain, domain->pgd, PAGE_SIZE);
@@ -4774,8 +4774,7 @@ static int prepare_domain_attach_device(struct iommu_domain *domain,
 
 		pte = dmar_domain->pgd;
 		if (dma_pte_present(pte)) {
-			dmar_domain->pgd = (struct dma_pte *)
-				phys_to_virt(dma_pte_addr(pte));
+			dmar_domain->pgd = phys_to_virt(dma_pte_addr(pte));
 			free_pgtable_page(pte);
 		}
 		dmar_domain->agaw--;