Some minor fixes to environment in NAND code.
diff --git a/common/env_nand.c b/common/env_nand.c
index 4896853..4ae68c5 100644
--- a/common/env_nand.c
+++ b/common/env_nand.c
@@ -115,7 +115,7 @@
 	int	total, ret = 0;
 
 	puts ("Erasing Nand...");
-	if (nand_erase(&nand_info[0], CFG_NEW_OFFSET, CFG_ENV_SIZE))
+	if (nand_erase(&nand_info[0], CFG_ENV_OFFSET, CFG_ENV_SIZE))
 		return 1;
 
 	puts ("Writing to Nand... ");