arm, post, memory: fix bug if sdram base != 0x00000000

commit 8d3fcb5e breaks post
memory support for sdram base != 0x00000000. Fix this.

Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Valentin Longchamp <valentin.longchamp@keymile.com>
Cc: Holger Brunck <holger.brunck@keymile.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>

post/drivers/memory.c

@@ -466,10 +466,11 @@ static int memory_post_test_regions(unsigned long start, unsigned long size)
 
 	for (i = 0; i < (size >> 20) && (!ret); i++) {
 		if (!ret)
-			ret = memory_post_test_patterns(i << 20, 0x800);
-		if (!ret)
-			ret = memory_post_test_patterns((i << 20) + 0xff800,
+			ret = memory_post_test_patterns(start + (i << 20),
 				0x800);
+		if (!ret)
+			ret = memory_post_test_patterns(start + (i << 20) +
+				0xff800, 0x800);
 	}
 
 	return ret;