git pull origin doesn't update the master

While updating the git code base the master branch is not getting
updated. First look tell me that the below commit is the issue
a9698bb22fb7b66e5882c3a5e7b2b8b53ea03f90

git-pull.sh does
git-fetch --update-head-ok "$@" || exit 1

and git-fetch.sh exit with status 1 printing the below message

* refs/heads/pu: does not fast forward to branch 'pu' of
http://git.kernel.org/pub/scm/git/git;
  not updating.


-aneesh
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