Staging: rtl8192u: Fix line over 80 characters

This patch splits the line so that doesn't exceeds 80 character mark.
Issue found by checkpatch.pl

Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>