Avoid a SIGABRT in sun file handling This is a partial fix for malformed sun file
Bug: http://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=26857 Bug-debian: https://bugs.debian.org/823750 Origin: upstream, https://github.com/ImageMagick/ImageMagick/commit/1aa0c6dab6dcef4d9bc3571866ae1c1ddbec7d8f