adopt some clang 5.0.0 formatting

At least the changes that don't conflict with 4.0.1

Change-Id: Iaa2fda027b8ab2b023d608cf5ec7b377a72b851e
diff --git a/webmdec.cc b/webmdec.cc
index 39ecef7..da44940 100644
--- a/webmdec.cc
+++ b/webmdec.cc
@@ -7,7 +7,7 @@
  * obtain it at www.aomedia.org/license/software. If the Alliance for Open
  * Media Patent License 1.0 was not distributed with this source code in the
  * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
-*/
+ */
 
 #include "./webmdec.h"