[Nut-upsdev] bestups bug fix

[Sadara Kael]

hi all,

really simple fix for the bestups driver:

In function:
upsdrv_makevartable()

you need to add the line
addvar(VAR_VALUE, "battvoltmult", "Battery voltage multiplier");

There are a number of simple improvements I could make to this driver, but I'm assuming that since the above bug has been around since nut v2.4, not many people are using this driver. 

Is this driver worth improving?

-Sadara