aufs: tiny, update the year in Copyright

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit 56b4b776c84f364384971c4cdfd66b4a2f0696d4)

fs/aufs/plink.c

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2005-2019 Junjiro R. Okajima
+ * Copyright (C) 2005-2020 Junjiro R. Okajima
  */
 
 /*

fs/aufs/poll.c

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2005-2019 Junjiro R. Okajima
+ * Copyright (C) 2005-2020 Junjiro R. Okajima
  */
 
 /*

fs/aufs/posix_acl.c

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2014-2019 Junjiro R. Okajima
+ * Copyright (C) 2014-2020 Junjiro R. Okajima
  */
 
 /*

fs/aufs/procfs.c

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2010-2019 Junjiro R. Okajima
+ * Copyright (C) 2010-2020 Junjiro R. Okajima
  */
 
 /*

fs/aufs/rdu.c

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2005-2019 Junjiro R. Okajima
+ * Copyright (C) 2005-2020 Junjiro R. Okajima
  */
 
 /*

fs/aufs/rwsem.h

 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * Copyright (C) 2005-2019 Junjiro R. Okajima
+ * Copyright (C) 2005-2020 Junjiro R. Okajima
  */
 
 /*

fs/aufs/sbinfo.c

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2005-2019 Junjiro R. Okajima
+ * Copyright (C) 2005-2020 Junjiro R. Okajima
  */
 
 /*

fs/aufs/super.c

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2005-2019 Junjiro R. Okajima
+ * Copyright (C) 2005-2020 Junjiro R. Okajima
  */
 
 /*

fs/aufs/super.h

 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * Copyright (C) 2005-2019 Junjiro R. Okajima
+ * Copyright (C) 2005-2020 Junjiro R. Okajima
  */
 
 /*

fs/aufs/sysaufs.c

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2005-2019 Junjiro R. Okajima
+ * Copyright (C) 2005-2020 Junjiro R. Okajima
  */
 
 /*

fs/aufs/sysaufs.h

 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * Copyright (C) 2005-2019 Junjiro R. Okajima
+ * Copyright (C) 2005-2020 Junjiro R. Okajima
  */
 
 /*

fs/aufs/sysfs.c

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2005-2019 Junjiro R. Okajima
+ * Copyright (C) 2005-2020 Junjiro R. Okajima
  */
 
 /*

fs/aufs/sysrq.c

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2005-2019 Junjiro R. Okajima
+ * Copyright (C) 2005-2020 Junjiro R. Okajima
  */
 
 /*

fs/aufs/vdir.c

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2005-2019 Junjiro R. Okajima
+ * Copyright (C) 2005-2020 Junjiro R. Okajima
  */
 
 /*

fs/aufs/vfsub.c

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2005-2019 Junjiro R. Okajima
+ * Copyright (C) 2005-2020 Junjiro R. Okajima
  */
 
 /*

fs/aufs/vfsub.h

 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * Copyright (C) 2005-2019 Junjiro R. Okajima
+ * Copyright (C) 2005-2020 Junjiro R. Okajima
  */
 
 /*

fs/aufs/wbr_policy.c

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2005-2019 Junjiro R. Okajima
+ * Copyright (C) 2005-2020 Junjiro R. Okajima
  */
 
 /*

fs/aufs/whout.c

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2005-2019 Junjiro R. Okajima
+ * Copyright (C) 2005-2020 Junjiro R. Okajima
  */
 
 /*

fs/aufs/whout.h

 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * Copyright (C) 2005-2019 Junjiro R. Okajima
+ * Copyright (C) 2005-2020 Junjiro R. Okajima
  */
 
 /*

fs/aufs/wkq.c

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2005-2019 Junjiro R. Okajima
+ * Copyright (C) 2005-2020 Junjiro R. Okajima
  */
 
 /*