cpukit/libds/src/ftpfs/tftpDriver.c: Manually update license to BSD-2

Eric Norum granted permission plus git log archeology to get year for
his copyright.

Updates #3053.

cpukit/libfs/src/ftpfs/tftpDriver.c

@@ -1,17 +1,39 @@
-/*
+/* SPDX-License-Identifier: BSD-2-Clause */
- * Trivial File Transfer Protocol (RFC 1350)
+
+/**
+ * @file
+ *
+ * Trivial File Transfer Protocol file system (TFTP client) for RFC 1350.
  *
  * Transfer file to/from remote host
- *
+ */
- * W. Eric Norum
+
- * Saskatchewan Accelerator Laboratory
+/*
- * University of Saskatchewan
+ * Copyright 1998 Eric Norum <eric.norum@usask.ca>
- * Saskatoon, Saskatchewan, CANADA
- * eric@skatter.usask.ca
  *
  * Modifications to support reference counting in the file system are
  * Copyright (c) 2012 embedded brains GmbH.
  *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifdef HAVE_CONFIG_H