gnu: imagemagick: Update to 6.9.2-1.

* gnu/packages/imagemagick.scm (imagemagick): Update to 6.9.2-1.
  [source]: Add imagemagick-test-segv.patch.
  [inputs]: Replace LIBJPEG-8 with LIBJPEG.

gnu-system.am

@@ -505,6 +505,7 @@ dist_patch_DATA =						\
   gnu/packages/patches/icecat-freetype-2.6.patch		\
   gnu/packages/patches/icecat-libvpx-1.4.patch			\
   gnu/packages/patches/icu4c-CVE-2015-4760.patch		\
+  gnu/packages/patches/imagemagick-test-segv.patch		\
   gnu/packages/patches/irrlicht-mesa-10.patch			\
   gnu/packages/patches/jbig2dec-ignore-testtest.patch		\
   gnu/packages/patches/julia-0.3.10-fix-empty-array.patch	\

gnu/packages/imagemagick.scm

@@ -23,6 +23,7 @@
   #:use-module (guix build-system perl)
   #:use-module (guix download)
   #:use-module ((guix licenses) #:select (fsf-free))
+  #:use-module (gnu packages)
   #:use-module (gnu packages algebra)
   #:use-module (gnu packages compression)
   #:use-module (gnu packages fontutils)
@@ -37,14 +38,15 @@
 (define-public imagemagick
   (package
     (name "imagemagick")
-    (version "6.9.1-3")
+    (version "6.9.2-1")
     (source (origin
              (method url-fetch)
              (uri (string-append "mirror://imagemagick/ImageMagick-"
                                  version ".tar.xz"))
              (sha256
               (base32
-               "18wbsjfccxlgsdsd6h9wvhcjrsglyi086jk4bk029ik07rh81laz"))))
+               "159afhqrj22jlz745ccbgnkdiwvn8pjcc96jic0iv9ms7gqxwln5"))
+             (patches (list (search-patch "imagemagick-test-segv.patch")))))
     (build-system gnu-build-system)
     (arguments
      `(#:phases (modify-phases %standard-phases
@@ -84,7 +86,7 @@
               ("libxml2" ,libxml2)
               ("libtiff" ,libtiff)
               ("libpng" ,libpng)
-              ("libjpeg" ,libjpeg-8)
+              ("libjpeg" ,libjpeg)
               ("pango" ,pango)
               ("freetype" ,freetype)
               ("bzip2" ,bzip2)

gnu/packages/patches/imagemagick-test-segv.patch

@@ -0,0 +1,20 @@
+This patch works around a segmentation fault in 'Magick++/tests/color' when
+running 'Magick++/tests/tests.tap'.  Here we get an exception early on, which
+is supposedly harmless:
+
+  Caught exception: color: UnableToOpenConfigureFile `colors.xml' @ warning/configure.c/GetConfigureOptions/706
+
+However, when the stack unwinders run, 'UnregisterDOTImage' gets called even
+though 'RegisterDOTImage' hadn't been called yet; thus, 'graphic_context' in
+coders/dot.c is NULL, leading to the segfault.
+
+--- ImageMagick-6.9.2-1/coders/dot.c	2015-09-16 17:32:42.900323334 +0200
++++ ImageMagick-6.9.2-1/coders/dot.c	2015-09-16 17:32:48.312367636 +0200
+@@ -240,6 +240,7 @@ ModuleExport void UnregisterDOTImage(voi
+   (void) UnregisterMagickInfo("GV");
+   (void) UnregisterMagickInfo("DOT");
+ #if defined(MAGICKCORE_GVC_DELEGATE)
++  if (graphic_context != NULL)
+   gvFreeContext(graphic_context);
+ #endif
+ }