Pushing from a clone of your normal git repo

I cloned of a repo to a USB stick and took it away to make changes. Then I wanted to put the changes back:

$ cd <clonedgitrepo>

$ git push
<blah blah blah>
 ! [remote rejected] master -> master (branch is currently checked out)
error: failed to push some refs to '<remotegitrepo>'

Oh dear. But after some googling, I found I can do this:

$ cd <remotegitrepo>

$ git checkout --detach
<blah blah> 'detached HEAD' state <blah blah>

$ cd <clonedgitrepo>

$ git push
<blah blah blah - works>

$ cd <remotegitrepo>

$ git checkout master
<blah blah blah>

Success! Now to post this to DW so that I can find it again next time that happens...