staging: wlan-ng: fix long line

Style (line over 80 chars) in drivers/staging/wlan-ng/prism2fw.c

Signed-off-by: Douglas Barbonaglia Sathler Figueiredo <eng.douglasfigueiredo@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>