iommu/dma: Remove unused variable

end_pfn is never used after commit <aa3ac946> ('iommu/iova: Make dma
32bit pfn implicit'), cleanup it.

Cc: Joerg Roedel <jroedel@suse.de>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/dma-iommu.c

@@ -289,7 +289,7 @@ int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
 {
 	struct iommu_dma_cookie *cookie = domain->iova_cookie;
 	struct iova_domain *iovad = &cookie->iovad;
-	unsigned long order, base_pfn, end_pfn;
+	unsigned long order, base_pfn;
 	int attr;
 
 	if (!cookie || cookie->type != IOMMU_DMA_IOVA_COOKIE)
@@ -298,7 +298,6 @@ int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
 	/* Use the smallest supported page size for IOVA granularity */
 	order = __ffs(domain->pgsize_bitmap);
 	base_pfn = max_t(unsigned long, 1, base >> order);
-	end_pfn = (base + size - 1) >> order;
 
 	/* Check the domain allows at least some access to the device... */
 	if (domain->geometry.force_aperture) {