scripts/checkpatch.pl: don't search for CREDITS when checking top_of_kernel_tree() ...

The CREDITS file is removed in the commit

    commit 6570288
    Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
    Date:   Tue Jan 13 14:27:07 2015 +0900

        Remove the CREDITS file

But checkpatch.pl still trying to check it presence.
There is not such CREDITS file and checkpatch.pl exits with
'Must be run from the top-level dir. of a kernel tree' message.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

checkpatch.pl: check for the FSF mailing address ...

This check code is imported from Linux v3.16 checkpatch.pl.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

scripts/checkpatch.pl: don't search for Doxyfile when checking top_of_kernel_tree() ...

Doxygen documentation is removed in the commit

  commit 98360be
  Author: Sascha Hauer <s.hauer@pengutronix.de>
  Date:   Tue Jun 17 10:27:03 2014 +0200

      Documentation: remove doxygen documentation

But checkpatch.pl still trying to check 'Doxyfile' presence.
There is not such 'Doxyfile' and checkpatch.pl exits with
'Must be run from the top-level dir. of a kernel tree' message.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

scripts: allow lines longer than 80 cols with printf() in checkpatch ...

The checkpatch.pl script is also used to validate user-space code in
the scripts/ directory, so it should allow printf() lines to be longer
than 80 columns.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

scripts/checkpatch.pl: reset rpt_cleaners warnings ...

When running checkpatch against multiple patches and one
of them has a whitespace issue, all following patches will
contain the same note, even if they are ok.

This patch is taken from the linux kernel:

scripts/checkpatch.pl: reset rpt_cleaners warnings
b078121
Written by Mike Frysinger <vapier@gentoo.org>

Signed-off-by: Teresa Gámez <t.gamez@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

scripts: Adapt checkpatch.pl for barebox. ...

Add directories from root of barebox to top_of_kernel_tree()
function for usage of script without additional parameters.

Signed-off-by: Marek Belisko <marek.belisko@open-nandra.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

scripts: Add checkpatch.pl script. ...

Overtake script checkpatch.pl from kernel source.

Signed-off-by: Marek Belisko <marek.belisko@open-nandra.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>