tests: Improve the codestyle test (#12988) Commit: https://github.com/vim/vim/commit/b147d314897b7a82081644edf779e22138d44f2c Author: Christian Brabandt <cb@256bit.org> Date: Fri Sep 1 17:58:35 2023 +0100 tests: Improve the codestyle test (https://github.com/vim/vim/issues/12988) Improve it by the following: 1) Also check xxd source 2) Test_source_files(): don't stop on the first error found, continue until the end of the file and report all found errors like this: Signed-off-by: Christian Brabandt <cb@256bit.org>