rename CFG_ENV_IS_IN_FLASH in CONFIG_ENV_IS_IN_FLASH

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/board/funkwerk/vovpn-gw/flash.c b/board/funkwerk/vovpn-gw/flash.c
index 7dd0d3f..935adfa 100644
--- a/board/funkwerk/vovpn-gw/flash.c
+++ b/board/funkwerk/vovpn-gw/flash.c
@@ -151,7 +151,7 @@
 		      CFG_MONITOR_FLASH+CFG_MONITOR_LEN-1,
 		      &flash_info[0]);
 #endif
-#ifdef	CFG_ENV_IS_IN_FLASH
+#ifdef	CONFIG_ENV_IS_IN_FLASH
 	flash_protect(FLAG_PROTECT_SET,
 		      CFG_ENV_ADDR,
 		      CFG_ENV_ADDR+CFG_ENV_SECT_SIZE-1,