DMR GPS Location Parsing Error

[DSheirer]

sdrtrunk Version
master.

Describe the bug
The GPS latitude and longitude values are parsed incorrectly. The ICD indicates the value is stored in two's complement presentation and the BinaryMessage.getTwosComplement() method is not calculating the value correctly. It should be:

    public int getTwosComplement(int start, int end)
    {
        if(get(start))
        {
            //Negative value - flip and add one
            BinaryMessage sub = getSubMessage(start, end);
            sub.flip(0, sub.size());
            return sub.getInt(1, sub.size()) + 1;
        }
        else
        {
            //Positive value - return the contents.
            return getInt(start + 1, end);
        }
    }