Bug#856444: gdk-pixbuf: CVE-2017-6312: Possible out-of-bounds read

[Salvatore Bonaccorso]

Control: tags -1 + fixed-upstream patch

Fixed upstream via:

https://git.gnome.org/browse/gdk-pixbuf/commit/?id=dec9ca22d70c0f0d4492333b4e8147afb038afd2

Regards,
Salvatore