[Pkg-gmagick-im-team] Bug#823750: Outofbound access in psd file

[Bastien ROUCARIES]

 Fix a outofbound access for psd file

    Added extra check to fix
https://github.com/ImageMagick/ImageMagick/issues/93

    origin: upstream,
https://github.com/ImageMagick/ImageMagick/commit/4b1b9c0522628887195bad3a6723f7000b0c9a58
    bug: https://github.com/ImageMagick/ImageMagick/issues/93
    bug-ubuntu:
https://bugs.launchpad.net/ubuntu/+source/imagemagick/+bug/1537419
    bug-debian: https://bugs.debian.org/823750