[PATCH] hwmon: via686a: save 0.5k by long v[256] -> s16 v[256]

We can save 0.5kB of data in the via686a driver.

From: Denis Vlasenko <vda@ilport.com.ua>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>