nits with new _git

[Mikael Magnusson <mikachu@xxxxxxxxx>]

Now that pws fixed the crash, I'm updating to the new _git, so far
I've noticed these two things.

git log --pret<tab> goes into correction, same for git show.
% git log --pretty=
---- option
--pretty  -- pretty print commit messages
---- corrections (errors: 2)
--grep    -- limit commits to those with log messages matching the given pattern
--pretty  -- pretty print commit messages

Usually this would hint at some missing ret=0 somewhere, but I
couldn't find any. Unconditionally returning 0 from _git does 'fix' it
though, so it must be somewhere.

The other thing is that git branch -d -r <tab> doesn't complete remote branches.

-- 
Mikael Magnusson