bug#21738: 25.0.50; eww freezes/crashes at times

[Kaushal Modi]

Hi all,

I updated to the latest Imagemagick (v 6.9.2-4) and "r -Q" emacs
session still freezes in gdb when I evaluate

(eww "http://www.braveclojure.com/basic-emacs";)

This time though, I got a much longer backtrace (attached) but the
main error is still similar (that number following UnregisterTIFFImage
changed):

> emacs: Memory allocation failed `No such file or directory' @ 
> fatal/tiff.c/UnregisterTIFFImage/2379.

emacs_25_Imagemagick_eww_freeze_gdb_bt.log
Description: Binary data