drivers: staging: gdm72xx: Removed unnecessary braces.

This patch fixes "braces {} are not necessary for single statement
blocks" checkpatch.pl warning in netlink_k.c

Signed-off-by: Gulsah Kose <gulsah.1004@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>