OS hacking: Fixing some image decoder bugs found by fuzzing

SerenityOS is open source on GitHub: https://github.com/SerenityOS/serenity Follow me on Twitter: https://twitter.com/awesomekling Sponsor me on GitHub: https://github.com/sponsors/awesomekling Support me on Patreon: https://patreon.com/serenityos Donate via Paypal: https://paypal.me/awesomekling SerenityOS is a Unix-like operating system that I'm implementing from scratch. http://www.serenityos.org/