* YUV coder no longer renders streaks (reference
https://github.com/ImageMagick/ImageMagick/issues/612).
* Fixed numerous memory leaks (reference
- https://github.com/ImageMagick/ImageMagick/issues).
+ https://github.com/ImageMagick/ImageMagick/issues) including
+ https://github.com/ImageMagick/ImageMagick/issues/618 (CVE-2017-12676).
* coders/png.c: Initialized quantum_scanline and quantum_info
to prevent a bad free (reference
https://github.com/ImageMagick/ImageMagick/issues/621).