[gtk] release-script: Actually compress the docs tarball

[Matthias Clasen <matthiasc src gnome org>]

commit 3daad8fe87c2ba05b8a3b6a530ad213d7b418a33
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Mar 14 23:33:10 2021 -0400

    release-script: Actually compress the docs tarball
    
    Somehow an x got lot and the tarball got very big. Oops...

 make-release.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/make-release.sh b/make-release.sh
index 7f77eaf634..d403486673 100755
--- a/make-release.sh
+++ b/make-release.sh
@@ -17,7 +17,7 @@ meson dist -C${release_build_dir} || exit
 meson configure ${release_build_dir} -Dintrospection=enabled -Dgtk_doc=true || exit
 ninja -C${release_build_dir} || exit
 
-tar cf ${release_build_dir}/meson-dist/gtk-docs-${version}.tar.xz -C${release_build_dir} docs/reference
+tar cxf ${release_build_dir}/meson-dist/gtk-docs-${version}.tar.xz -C${release_build_dir} docs/reference
 
 echo -e "\n\nGTK ${version} release on branch ${branch} in ./${release_build_dir}/:\n"