2019.01.05 20:01 "Re: [Tiff] 1 line patch for patch-tiff2ps.c", by Bob Friesenhahn
I submitted a fix to the libtiff source repository (git) which allows your file to be converted successfully. The problem appears to be caused by a recent security fix which was a bit too strict.
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
Public Key, http://www.simplesystems.org/users/bfriesen/public-key.txt