checkpatch: remove unnecessary + after {8,8}

Pick the following commit from Linux kernel:
commit 66cb4ee0e52ca721f609fd5eec16187189ae5fda
Author: Joe Perches <joe@perches.com>
Date:   Wed Sep 10 09:40:47 2014 +1000

checkpatch: remove unnecessary + after {8,8}

There's a useless "+" use that needs to be removed as perl 5.20 emits a
"Useless use of greediness modifier '+'" message each time it's hit.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Tom Rini <trini@ti.com>