Fix a theoretical out of bound access in magick/colormap-private.h. CVE assignment: http://seclists.org/oss-sec/2016/q2/459 Upstream patch included in the following patch set: https://anonscm.debian.org/cgit/collab-maint/imagemagick.git/log/?h=debian-patches/6.8.9.9-4-for-upstream