Merge branch 'jn/branch-move-to-self' into maint

* jn/branch-move-to-self: Allow checkout -B <current-branch> to update the current branch branch: allow a no-op "branch -M <current-branch> HEAD"

Junio C Hamano committed Dec 28, 2011 at 11:32 UTC 79587741cbed7704d2e7213c999cf2841af3000d

No changes.