git-submodule: remove redundant call to git-describe
git-submodule: remove redundant call to git-describe

The code to find a more descriptive name given a commit in a
submodule were improved in bffe71f, but it forgot to remove the
older logic the patch replaced.

Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git