[poppler] [PATCH] Fullrewrite produces an invalid XRef table entry

[Fabio D'Urso]

When fullrewriting https://bugzilla.gnome.org/attachment.cgi?id=166995 we 
currently write a "-000000001 00000 f" entry in the XRef table for object 19.
It is obviously invalid and I'm attaching a patch to fix it.
The -1 value comes from XRefEntry::offset being left to the initial value of 
0xffffffff (which is actually a placeholder for uninitialized value).

Fabio
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