PowerStatus may divide with 0 and crash Deskbar

[tqh]

PowerStatus reads a value without checking if it zero before doing a divide, which can crash Deskbar (and did so with the default ACPI code here).

Patch included.

[tqh]

Fixed style on if(

[tqh]

The idea is that we only update fPercent if we have full_capacity value other than 0. Otherwise we keep the old value, which may be -1 (never set) or the last known value.

[axeld]

So far so good, but why setting the color to white? If there is no value, the battery should look the same way as if it isn't there.

[tqh]

I wanted to see when it hadn't gotten valid data, that it was in 'state unknown'. The color or if it should be there I leave to you, but it is at least useful for me atm.

[axeld]

Applied in hrev32888.