sandbox: Properly print physical addresses

Use the %pap printf specifier to print physical addresses. The physical
address is passed by reference and hence avoids the need to play tricks
with the preprocessor to use the correct specifier.

Signed-off-by: Thierry Reding <treding@nvidia.com>
diff --git a/arch/sandbox/lib/pci_io.c b/arch/sandbox/lib/pci_io.c
index 5039973..01822c6 100644
--- a/arch/sandbox/lib/pci_io.c
+++ b/arch/sandbox/lib/pci_io.c
@@ -34,7 +34,7 @@
 		return 0;
 	}
 
-	debug("%s: failed: addr=%x\n", __func__, paddr);
+	debug("%s: failed: addr=%pap\n", __func__, &paddr);
 	return -ENOSYS;
 }