Staging: arlan: arlan.h: Fixed some style issues

Fixed some style issues in accordance with checkpatch.pl. Before the
patch contained "total: 2 errors, 186 warnings, 535 lines checked" and
now it has: total: 0 errors, 170 warnings. Most of the warnings that
remain now are the line over 80 chars ones.

Signed-off-by: Vikram Dhillon <dhillonv10@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>