[Bug 1594060] Re: abort when writing rgf format

[David Lechner]

This patch is tested working on Ubuntu 16.04.

** Patch added: "fix-abort-on-write-rgf.patch"
   https://bugs.launchpad.net/debian/+source/imagemagick/+bug/1594060/+attachment/4686446/+files/fix-abort-on-write-rgf.patch

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https://bugs.launchpad.net/bugs/1594060

Title:
  abort when writing rgf format

Status in imagemagick package in Ubuntu:
  New
Status in imagemagick package in Debian:
  Unknown

Bug description:
  rgf is an image format used on LEGO MINDSTORMS EV3.

  When trying to convert an image to the rgf format using `convert`, the
  program aborts.

  Example

  $ convert mindstorms.bmp mindstorms.rgf
  convert: ../../coders/rgf.c:345: WriteRGFImage: Assertion `exception != (ExceptionInfo *) NULL' failed.
  Aborted (core dumped)

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