minigbm: Remove (c) from copyright notice.

The pre-submit hook script checks that copyright messages don't
contain "(c)".

This CL removes "(c)" from all the copyrights header in minigbm
that still have it.

BUG=None
TEST=emerge-$BOARD minigbm.

Change-Id: I1922d9d29b78d124302d497310fe1c1cfd6fc695
Reviewed-on: https://chromium-review.googlesource.com/421588
Commit-Ready: David Reveman <reveman@chromium.org>
Commit-Ready: Daniele Castagna <dcastagna@chromium.org>
Tested-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
diff --git a/gbm.c b/gbm.c
index 7389cd8..1a81e7e 100644
--- a/gbm.c
+++ b/gbm.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
+ * Copyright 2014 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */