JPEG with EXIF loop results in hang/endless loop

[petervwyatt]

This JPEG, reportedly with a loop in the EXIF data, http://www.danalog.org/images/exif-loop.jpg makes JPEGsnoop completely unresponsive and hang/endless loop with high CPU usage - you have to manually kill the process via Task Manager. Occurs for both GUI and CLI usage.

This JPEG is referenced from this other GitHub issue in TwelveMonkeys: haraldk/TwelveMonkeys#477

Thanks.