powerpc: unrel_branch_check.sh: fix up the file header

#!/bin/bash

# Copyright © 2016 IBM Corporation

# SPDX-License-Identifier: GPL-2.0+

# Copyright © 2016,2020 IBM Corporation

#

# This program is free software; you can redistribute it and/or

# modify it under the terms of the GNU General Public License

# as published by the Free Software Foundation; either version

# 2 of the License, or (at your option) any later version.

#

# This script checks the relocations of a vmlinux for "suspicious"

# branches from unrelocated code (head_64.S code).

# Turn this on if you want more debug output:

# set -x

# This script checks the unrelocated code of a vmlinux for "suspicious"

# branches to relocated code (head_64.S code).

# Have Kbuild supply the path to objdump so we handle cross compilation.

objdump="$1"