rename CFG_ENV_IS_NOWHERE in CONFIG_ENV_IS_NOWHERE

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/include/configs/modnet50.h b/include/configs/modnet50.h
index 5159897..84540f5 100644
--- a/include/configs/modnet50.h
+++ b/include/configs/modnet50.h
@@ -171,7 +171,7 @@
 
 /* environment settings */
 #define	CFG_ENV_IS_IN_FLASH
-#undef CFG_ENV_IS_NOWHERE
+#undef CONFIG_ENV_IS_NOWHERE
 
 #define CFG_ENV_ADDR		0x1001C000 /* environment start address */
 #define CFG_ENV_SECT_SIZE       0x10000 /* Total Size of Environment Sector */