Staging: bcm: Replaced long member-accessing

This patch replaces long object->member.member foo by variable useage.
Increases the reading experience a lot by introducing only one variable
(as it decreases the whoa-wall-of-text experience).

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>