Coding Style cleanup: remove trailing white space

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/board/sandbox/sandbox/README.sandbox b/board/sandbox/sandbox/README.sandbox
index bcb2f33..30b0541 100644
--- a/board/sandbox/sandbox/README.sandbox
+++ b/board/sandbox/sandbox/README.sandbox
@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 2011 The Chromium OS Authors.
  *
- * SPDX-License-Identifier:	GPL-2.0+ 
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 
 Native Execution of U-Boot