Use any of the branches that point to origin/HEAD if there are multiple

Use any of the branches that point to origin/HEAD if there are multiple

'set-head origin --auto' fails if there are multiple branches that are the
same as origin/HEAD:

error: Multiple remote HEAD branches. Please choose one explicitly with:
  git remote set-head origin develop
  git remote set-head origin master

So we want to grab any of them, e.g. the first branch that it gives us, and
just use that as it will work just fine.