[xml] Line number value limit

[Csaba Raduly <rcsaba gmail com>]

Why is the line number in xmlNode limited to an unsigned short ?
Doesn't libxml2 handle XML files with more than 65535 lines?

Also, the code which performs the truncation of the value in SAX2.c
(line 1601) is wrong.

    if (ctxt->linenumbers) {
        if (ctxt->input != NULL) {
            if (ctxt->input->line < 65535)
                ret->line = (short) ctxt->input->line;
            else
                ret->line = 65535;
        }
    }

The cast should be to (unsigned short)

Csaba
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