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>