[xmlsec] Problem with some cert which has a negative serial number

[Aleksey Sanin]

>> Note that this is not only 00s but also FFs for negative values
>> (11, 111, 1111, 11111, etc. all represent the same -1).
> 
Yes, I understand this. It was a bad example. A better example would
be big numbers "FF", "FF FF", "FF FF FF" => all represent -1.

Aleksey