hwmon: (pc87360) Avoid initializing the same field twice

data is kzalloc'd, so data->valid, data->innr and data->tempnr are
already 0. Also rework the initialization path to only set name and
data->fannr once.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>