Fix some more printf() format issues.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/board/mp2usb/flash.c b/board/mp2usb/flash.c
index 89ced16..c19d445 100644
--- a/board/mp2usb/flash.c
+++ b/board/mp2usb/flash.c
@@ -426,7 +426,7 @@
 
 	/* Check if Flash is (sufficiently) erased */
 	if ((*addr & data) != data) {
-		printf ("not erased at %08lx (%lx)\n", (ulong) addr, *addr);
+		printf ("not erased at %08lx (%lx)\n", (ulong) addr, (ulong) *addr);
 		return (2);
 	}
 	/*