Meta: Show GML formatting issues after lint

Author: https://github.com/alimpfard
Commit: https://github.com/SerenityOS/serenity/commit/7f39142f0f
Pull-request: https://github.com/SerenityOS/serenity/pull/24098
Reviewed-by: https://github.com/ADKaster ✅

Meta/lint-gml-format.sh

@@ -2,6 +2,8 @@
 
 set -e
 
+trap 'git diff --exit-code' EXIT
+
 script_path=$(cd -P -- "$(dirname -- "$0")" && pwd -P)
 cd "${script_path}/.." || exit 1