Running checkpatch with perl version 5.22 occur the following warnings:

Unescaped left brace in regex is deprecated, ... checkpatch.pl line 2017.
Unescaped left brace in regex is deprecated, ... checkpatch.pl line 2267.
Unescaped left brace in regex is deprecated, ... checkpatch.pl line 2268.
...
lot of weird things
...
)\(.*\).*\s{ <-- HERE / at ./scripts/checkpatch.pl line 2016.

This patch fix these warning, an similar commit was done in linux kernel
commit: 4e5d56b ("checkpatch: fix left
brace warning").

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>