iommu: Fix integer truncation

On 32-bit architectures, phys_addr_t may be different from dma_add_t,
both smaller and bigger. This can lead to an overflow during an assignment
that clang warns about:

drivers/iommu/dma-iommu.c:230:10: error: implicit conversion from 'dma_addr_t' (aka 'unsigned long long') to
      'phys_addr_t' (aka 'unsigned int') changes value from 18446744073709551615 to 4294967295 [-Werror,-Wconstant-conversion]

Use phys_addr_t here because that is the type that the variable was
declared as.

Fixes: aadad09 ("iommu/dma: Reserve IOVA for PCIe inaccessible DMA address")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/dma-iommu.c

@@ -240,8 +240,8 @@ static int iova_reserve_pci_windows(struct pci_dev *dev,
 		start = window->res->end - window->offset + 1;
 		/* If window is last entry */
 		if (window->node.next == &bridge->dma_ranges &&
-		    end != ~(dma_addr_t)0) {
-			end = ~(dma_addr_t)0;
+		    end != ~(phys_addr_t)0) {
+			end = ~(phys_addr_t)0;
 			goto resv_iova;
 		}
 	}