devtool modify go-helloworld

fails with 

Traceback (most recent call last):
  File "/mnt/build/poky/scripts/devtool", line 350, in <module>
    ret = main()
          ^^^^^^
  File "/mnt/build/poky/scripts/devtool", line 337, in main
    ret = args.func(args, config, basepath, workspace)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/mnt/build/poky/scripts/lib/devtool/standard.py", line 907, in modify
    (stdout, _) = bb.process.run('git submodule --quiet foreach --recursive  \'echo `git rev-parse devtool-base` $PWD\'', cwd=srctree)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/mnt/build/poky/bitbake/lib/bb/process.py", line 189, in run
    raise ExecutionError(cmd, pipe.returncode, stdout, stderr)
bb.process.ExecutionError: Execution of 'git submodule --quiet foreach --recursive  'echo `git rev-parse devtool-base` $PWD'' failed with exit code 128:
fatal: No url found for submodule path 'src/golang.org/x/example' in .gitmodules

This was not the case on nanbield, I think it's changes introduced in OE-Core  

900129cbdf25297a42ab5dbd02d1adbea405c935 devtool: add support for git submodules

which collides with the source dir path manipulation from go.bbclass.