env_nand: Remove DEBUG definition

Signed-off-by: Thomas Weber <weber@corscience.de>
diff --git a/common/env_nand.c b/common/env_nand.c
index ce13def..3cb75c8 100644
--- a/common/env_nand.c
+++ b/common/env_nand.c
@@ -30,8 +30,6 @@
  * MA 02111-1307 USA
  */
 
-#define DEBUG
-
 #include <common.h>
 #include <command.h>
 #include <environment.h>