Merge branch 'lm/git-blame-el'

eLisp fixes for a contrib/ script.

* lm/git-blame-el:
git-blame.el: Do not use bare 0 to mean (point-min)
git-blame.el: Use with-current-buffer where appropriate
git-blame.el: Do not use goto-line in lisp code

diff --cc contrib/emacs/git-blame.el
Simple merge