Bug#856445: gdk-pixbuf: CVE-2017-6313: Integer underflow in io-icns.c

[Salvatore Bonaccorso]

Control: tags -1 + fixed-upstream patch

Fixed upstream via:

https://git.gnome.org/browse/gdk-pixbuf/commit/?id=210b16399a492d05efb209615a143920b24251f4

Regards,
Salvatore