Add copyright and author after file split

Signed-off-by: NStefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

migration/qemu-file-buf.c

@@ -2,6 +2,10 @@
  * QEMU System Emulator
  *
  * Copyright (c) 2003-2008 Fabrice Bellard
+ * Copyright (c) 2014 IBM Corp.
+ *
+ * Authors:
+ *  Stefan Berger <stefanb@linux.vnet.ibm.com>
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal