rpmgrill reports a false error in gscan2pdf-1.8.11-1.fc28 <https://taskotron.fedoraproject.org/artifacts/all/72ccc840-04e2-11e8-81b5-525400fc9f92/task_output/rpmgrill.json>:

      {
         "module" : "DesktopLint",
         "order" : 93,
         "results" : [
            {
               "arch" : "noarch",
               "code" : "DesktopIconFileMissing",
               "context" : {
                  "excerpt" : [
                     "Icon=gscan2pdf"
                  ],
                  "lineno" : 7,
                  "path" : "/usr/share/applications/gscan2pdf.desktop"
               },
               "diag" : "Icon file <var>gscan2pdf</var> not found",
               "subpackage" : "gscan2pdf"
            }
         ],

The packages installs "gscan2pdf" icon into /usr/share/pixmaps/gscan2pdf.svg, yet the DesktopLint module does not recognize it.

The patch is valid one per <https://specifications.freedesktop.org/desktop-entry-spec/desktop-entry-spec-1.1.html#key-icon> and <https://specifications.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html#directory_layout>.