hwmon: (adm1031) Various cleanups

* Rename new_client to client
* Drop redundant initializations to 0
* Drop trailing space
* Other whitespace cleanups
* Split/fold a few long lines
* Constify static data
* Optimizations in set_fan_div()

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>